CN112617940A - Anastomat capable of implementing prepressing and control method thereof - Google Patents

Abstract

The invention discloses an anastomat capable of implementing prepressing and a control method thereof.A pushing rack is driven to move by a pushing block through an operating handle, a swinging block is driven to rotate, a plurality of intermediate driving components such as a swinging block connecting rod, a swinging block push rod and the like are utilized to drive a prepressing sleeve to move towards the far end of the anastomat, and a jaw of an actuator is closed; the pushing rack drives the middle driving part and the pre-pressing sleeve to move towards the near end of the anastomat through the firing rod, so that the jaw is opened. The invention can respectively carry out the firing operation of prepressing and cutting anastomosis by depending on one handle, thereby simplifying the structure of the prepressing component of the anastomat.

Description

Anastomat capable of implementing prepressing and control method thereof

Technical Field

The invention relates to an anastomat, in particular to an anastomat capable of implementing prepressing and a control method thereof.

Background

Staplers are devices used in medicine instead of manual suturing. The anastomat is generally provided with an actuator, a cutting knife and other structures. In operation, a tissue to be anastomosed is clamped and occluded in a jaw of an actuator (comprising a nail bin assembly and a nail felt assembly), a handle of an instrument gun is pressed down to drive a cutting knife to break the tissue, and anastomotic nails arranged in the nail bin assembly are pushed out and formed to anastomose the tissue.

The existing anastomats are basically divided into two types. Fig. 29 shows a stapler having an independent prepressing mechanism, which can close the jaws of the actuator to clamp tissue and then perform the cutting and stapling operation, but the prepressing mechanism has a very complicated structure, and the product has two handles a and B, one handle B is specially used for controlling the prepressing mechanism to move to perform the prepressing operation; the other handle A is specially used for driving a cutting knife and other components to move so as to perform the operation of cutting anastomosis. The scheme needs to switch the handle, so that the operation of an operator is inconvenient; in addition, the angle between the handle a for the front operation and the handle of the main body is too large, so that the operator cannot hold the handle a conveniently.

Another stapler, as shown in FIG. 30, has an integrally detachable disposable assembly C at the distal end thereof, without a separate prepressing mechanism therefor. This anastomat's initial pre-compaction operation relies on the first removal of cutting knife to accomplish, and the mechanical properties requirement to the cutting knife is higher, moreover because the intensity problem of cutting knife leads to the pre-compaction effect not obvious.

Disclosure of Invention

The invention aims to provide an anastomat capable of performing prepressing and a control method thereof.

In order to achieve the above object, the present invention provides a stapler;

the anastomat is provided with a pushing rack, a swinging block connecting rod, an intermediate driving part and a prepressing sleeve;

the swinging block can rotate around a rotating shaft under the driving of the pushing rack;

the near end and the far end of the swinging block connecting rod are respectively hinged with the swinging block and the near end of the middle driving part;

the far end of the middle driving part is connected with the prepressing sleeve;

when the swinging block rotates in the first direction, the swinging block connecting rod drives the middle driving part and the prepressing sleeve to move towards the far end of the anastomat, and the jaw of the executor is closed through the prepressing sleeve.

Optionally, the swing block connecting rod and the instrument central axis of the anastomat form a first included angle; the opening of the first included angle faces to the proximal end of the anastomat; the pushing rack moves towards the near end or the far end of the anastomat along the central axis of the anastomat and drives the swinging block to rotate, and the angle of the first included angle is increased or decreased.

Optionally, a second included angle is formed between the swing block and the swing block connecting rod; a connecting line from the hinged position of the swing block and the swing block connecting rod to the rotating shaft forms an included angle with the swing block connecting rod, and the included angle is the second included angle; and when the pushing rack moves towards the near end or the far end of the anastomat and drives the swinging block to rotate, the angle of the second included angle is reduced or enlarged.

Optionally, when the jaws of the actuator are not closed by the pre-stressed sleeve, the second included angle is an acute angle with the opening facing the distal end of the stapler; in the closing process of a jaw of the actuator by the prepressing sleeve, the second included angle is adjusted to be an obtuse angle with an opening facing to the far end of the anastomat; continuously impel the propulsion rack drives the pendulum piece and continuously rotates, makes the second contained angle from the opening towards the obtuse angle of anastomat distal end, adjusts to the straight angle to the second contained angle, and the second contained angle adjustment is the obtuse angle of opening towards the anastomat near-end again, and the pendulum piece connecting rod contacts the limit point that sets up in the firing subassembly shell this moment, with the rotation locking of pendulum piece, forms the dead state of lock.

Optionally, after the jaw of the actuator is closed by the pre-pressing sleeve, a reaction force from the pre-pressing sleeve is transmitted to the swing block through the middle driving part and the swing block connecting rod, so that the angle of the current second included angle and the opening direction of the swing block are maintained, and the pre-pressing sleeve is locked, so that the jaw is continuously closed.

Optionally, the anastomat is provided with a firing rod and a cutting knife assembly, the firing rod is connected between the distal end of the propulsion rack and the proximal end of the knife handle of the cutting knife assembly, and can move along the central axis of the instrument under the driving of the propulsion rack; the firing rod is also connected with the middle driving part;

the pushing rack moves towards the far end of the anastomat and drives the swinging block to rotate around the rotating shaft in the first direction, and the pre-pressing sleeve moves to a set position outside the near end of the actuator to close the jaw of the actuator;

the pushing rack moves towards the near end of the anastomat, when the swinging block is driven to rotate around the rotating shaft in the second direction, the pre-pressing locking state is released, and meanwhile, the swinging block connecting rod moves towards the near end of the anastomat; the pushing rack also drives the firing rod to move towards the near end of the anastomat, the firing rod drives the pre-pressing sleeve to move towards the near end of the anastomat through the middle driving part, so that the pre-pressing sleeve is moved away from the set position, and the jaw of the executor is opened;

the first direction is clockwise and the second direction is counterclockwise; alternatively, the first direction is counterclockwise and the second direction is clockwise.

Optionally, the swing block rotates around the rotating shaft in the first direction, and after being blocked by a limiting component arranged on the anastomat, the swing block does not rotate around the rotating shaft; at this point, the pusher rack can continue to move distally of the stapler without rotating the pendulum mass.

Optionally, when the swing block rotates around the rotating shaft in the first direction to the maximum swing angle, the swing block is blocked by a slope arranged in a housing of a firing assembly of the anastomat, and the rotation is stopped.

Optionally, the pushing rack is provided with a section of first racks arranged along a straight line; the straight line is parallel to the instrument central axis of the anastomat; the swing block is provided with a section of gear structure arranged along an arc shape;

the gear structure is meshed with or separated from the first rack along with the pushing rack moving along the central axis of the instrument; when the gear structure is meshed with the first rack, the swinging block rotates around the rotating shaft under the driving of the pushing rack.

Optionally, the first rack is positioned at the upper part of the pushing rack and protrudes out of the upper surface of the pushing rack; the swinging block is arranged above the pushing rack, and the gear structure is positioned on the arc-shaped lower surface of the swinging block;

when the pushing rack drives the swinging block to rotate, the teeth which are currently meshed with the first rack in the gear structure of the swinging block are switched.

Optionally, the process that the pushing rack drives the swing block to rotate around the rotating shaft in the first direction corresponds to the process from the engagement of the tooth at the farthest end of the gear structure with the tooth socket at the farthest end of the first rack to the engagement of the tooth socket at the nearest end of the gear structure with the tooth at the nearest end of the first rack;

and the process from the process that the pushing rack drives the swinging block to rotate around the rotating shaft in the second direction corresponds to the process from the meshing of the tooth socket at the most proximal end of the gear structure and the tooth socket at the most proximal end of the first rack to the process from the meshing of the tooth socket at the most distal end of the gear structure and the tooth socket at the most distal end of the first rack.

Optionally, the pushing rack moves towards the distal end of the anastomat, and when the gear structure of the swinging block is disengaged from the first rack, the pre-pressing sleeve moves to a set position outside the proximal end of the actuator to close the jaws of the actuator; when the pushing rack continues to move towards the far end of the anastomat, the swinging block is not driven to rotate any more; the jaws of the actuator are continuously closed by the pre-stressed sleeve.

Optionally, the pushing rack is provided with a section of second rack and a section of idle-stroke groove, the second rack and the idle-stroke groove are positioned on the same surface of the pushing rack, and the idle-stroke groove is closer to the far end of the pushing rack than the second rack;

a pushing block is arranged at the handle of the anastomat and rotates along with the rotation of the handle;

the tilting end of the pushing block is moved to a tooth groove at the farthest end of the second rack from the idle-stroke groove by operating the handle, the pushing rack moves to the far end of the anastomat and drives the swinging block to rotate to the limit position of the swinging block around the rotating shaft in the first direction; at the moment, the prepressing sleeve pipe moves to a set position outside the near end of the actuator, and the jaw of the actuator is closed;

and then, the tooth groove of the second rack, which is currently entered by the tilting end of the pushing block, is switched by controlling the handle each time to push the pushing rack to continuously move to the far end of the anastomat, and the pushing rack does not drive the swinging block to rotate any more.

Optionally, the intermediate driving part comprises a pre-pressing ejector rod, a pre-pressing insertion piece, a trigger rod sleeve, a sleeve and a swinging block push rod which are arranged in sequence, and can transmit acting force from the swinging block connecting rod to move towards the far end or the near end of the anastomat along the central axis of the instrument and drive the pre-pressing sleeve to move towards the far end or the near end of the anastomat;

the near end of the pendulum block push rod parallel to the central axis of the instrument is hinged with the far end of the pendulum block connecting rod; the sleeve is allowed to rotate around the central axis of the instrument relative to the swing block push rod between the proximal end of the sleeve and the distal end of the swing block push rod; the sleeve is provided with a through hole along the central axis of the instrument, and the near end of the firing rod sleeve is connected to the far end of the through hole of the sleeve; the far end of the trigger rod sleeve is connected with the near end of the prepressing ejector rod through a prepressing insertion piece; the far end of the prepressing ejector rod is connected with the near end of the prepressing sleeve.

Optionally, the pre-pressing ejector rod is provided with a protruding T-shaped structure embedded in a T-shaped groove of the pre-pressing sleeve.

Optionally, the prepressing sleeve is respectively connected with two prepressing ejector rods on two sides of the central shaft of the instrument; at least one prepressing insert is connected between the two prepressing ejector rods; a firing rod penetrates through the firing rod sleeve, is connected between the far end of the propelling rack and the near end of the cutter handle of the cutter assembly and can move along the central axis of the instrument under the driving of the propelling rack; when the trigger rod sleeve and the trigger rod move, the two prepressing ejector rods are driven to move by the prepressing insertion pieces; the prepressing insertion piece is embedded in the circumferential surface of the trigger rod sleeve; the circumference surface of firing bar is provided with the step, and the near-end of step and the distal end contact of pre-compaction inserted sheet drive the pre-compaction inserted sheet and remove to the near-end of anastomat when the firing bar withdraws.

Optionally, the anastomat is provided with a reset assembly for driving the pushing rack to move towards the proximal end of the anastomat to realize retraction; through withdrawing, make the propulsion piece leave the surface of propelling rack, the propulsion rack can drive the pendulum piece again, and the limited position from the pendulum piece is around the rotation axis with the second direction, and meanwhile, the propulsion rack drives the firing bar and withdraws, and the distal end of the step near-end contact pre-compaction inserted sheet through the firing bar drives the pre-compaction inserted sheet and moves to the near-end of anastomat, and then draws the pre-compaction sleeve pipe through the pre-compaction ejector pin, makes the pre-compaction sleeve pipe can remove from the setting position of executor near-end outside, and the jaw of executor opens.

Optionally, the stapler is provided with a safety block which prevents the pushing rack from moving towards the distal or proximal end of the stapler when entering the locking slot of the pushing rack; the safety block can be separated from the locking groove by operating the safety button; the safety block has an initial position outside the range of the pushing rack;

when the pushing block is driven to move the pushing rack to the far end of the anastomat by operating the handle, the safety block enters a locking groove within the range of the pushing rack from the initial position; at the moment, the swinging block is driven by the pushing rack to rotate to the limit position of the swinging block around the rotating shaft in the first direction, and the pre-pressing sleeve moves to the set position outside the near end of the actuator to close the jaw of the actuator.

Optionally, the reset assembly is operated to drive the pushing rack to move towards the proximal end of the anastomat, and when the withdrawing is carried out, the safety block returns to the initial position outside the range of the pushing rack from the locking groove; at the moment, the pushing rack can drive the swing block again, the swing block rotates around the rotating shaft in the second direction from the limited position of the swing block, the pushing rack drives the firing rod to retract, the pre-pressing sleeve is driven to move through the firing rod, the pre-pressing insertion piece and the pre-pressing ejector rod, the pre-pressing sleeve can move away from the set position outside the near end of the actuator, and the jaw of the actuator is opened.

Optionally, a connecting rod connecting piece is arranged at the swinging block and is parallel to the rotating shaft of the swinging block; the connecting rod connecting piece penetrates through a waist-shaped hole at the near end of the swinging block connecting rod, so that the swinging block is hinged with the near end of the swinging block connecting rod.

Optionally, the actuator of the anastomat is driven by a fixing block connected with the proximal end of the anastomat to deflect relative to the central shaft of the instrument; the middle driving part comprises a prepressing ejector rod connected with the prepressing sleeve, and the prepressing ejector rod is also used for driving the limiting ejector rod to move towards the far end of the anastomat until the limiting ejector rod is inserted into a groove corresponding to the current deflection angle at the fixed block, so as to lock the deflection angle; the fixing block is provided with a plurality of grooves corresponding to different deflection angles.

Optionally, the pre-pressing sleeve is provided with a limiting groove, and the limiting ejector rod can move in the limiting groove; when the prepressing sleeve is driven by the prepressing ejector rod to move towards the near end of the anastomat, the far end point of the limiting groove is abutted to the limiting ejector rod, and the limiting ejector rod is withdrawn from the groove of the fixing block.

Optionally, when the limiting ejector rod is inserted into a groove corresponding to the current deflection angle at the fixed block, the pre-pressing sleeve reaches a set position at the actuator, and the jaw of the actuator is closed; when the limiting ejector rod is withdrawn from the groove of the fixed block, the pre-pressing sleeve leaves the set position of the actuator, and the jaw of the actuator is opened.

Optionally, the prepressing mandril is positioned in a groove formed in the guide part and can move along the central axis of the instrument towards the far end or the near end of the anastomat in the groove; the guide part is positioned outside the knife handle of the cutting knife assembly and the trigger rod sleeve; the near end of the prepressing sleeve is sleeved outside the far end of the guide part.

Optionally, the two cutting knife guard plates positioned on two sides of the central axis of the instrument are arc structures with opposite inner surfaces, and the inner surfaces of the two cutting knife guard plates are recessed to form a space for the knife handle of the cutting knife assembly to move along the central axis of the instrument; the inner surface is a surface close to the central axis of the instrument;

one of the two cutting knife guard plates moves towards the near end of the anastomat, and when the other one moves towards the far end of the anastomat, the two cutting knife guard plates deflect relative to the central axis of the instrument respectively, the knife handle is bent, and the inner surface of the cutting knife guard plate corresponding to one side of the knife handle is attached to the part, protruding towards the other side, of the knife handle due to bending, so that smooth turning is achieved.

Optionally, two elastic pieces are arranged between the cutting knife guard plates to serve as inner liners;

the inner surface of the cutting knife guard plate is provided with a groove matched with the lining;

when the knife handle is not bent, the two linings are respectively positioned on the two sides of the knife handle and are tightly attached to the surface of the knife handle;

the part of the handle protruding to one side of the handle is bent to push the corresponding lining to deform and enter the groove of the cutting knife guard plate at the side, so that the part of the handle protruding to the side can be attached to the inner surface of the cutting knife guard plate and/or the lining at the side to realize smooth turning;

the handle is bent to be attached to the concave part at the other side by the deformed lining corresponding to the other side.

Optionally, the actuator of the anastomat is driven by a fixing block connected with the proximal end of the anastomat to deflect relative to the central shaft of the instrument; the far ends of the two cutting knife guard plates are rotatably connected to the first side and the second side of the fixing block and are used for driving the fixing block to deflect; the first side and the second side are located on both sides of the instrument central axis and respectively correspond to the deflection directions.

Optionally, the pre-pressing sleeve comprises a first pre-pressing sleeve close to the distal end of the anastomat and a second pre-pressing sleeve close to the proximal end of the anastomat, and the first pre-pressing sleeve and the second pre-pressing sleeve can deflect relatively through the hinge of the sleeve connecting piece between the first pre-pressing sleeve and the second pre-pressing sleeve;

when the actuator is driven by a fixed block connected with the actuator to deflect relative to the central axis of the instrument, a first pre-pressing sleeve sleeved outside the actuator and/or the fixed block deflects relative to the central axis of the instrument, and a second pre-pressing sleeve does not deflect relative to the central axis of the instrument;

and a space is reserved between the first pre-pressing sleeve and the second pre-pressing sleeve for the deflection of the fixing block and/or the cutting knife protection plate relative to the central axis of the instrument.

Optionally, the fixing block is provided with a fixing block connecting part extending towards the proximal end of the anastomat;

the fixed block connecting part is hinged with the far end of the fixed plate, and the fixed block deflects relative to the central axis of the instrument around the hinged position; the proximal end of the fixing plate is embedded into the groove at the distal end of the guide part, so that the fixing plate does not deflect relative to the central axis of the instrument.

Optionally, the proximal ends of the two cutting knife guard plates are respectively and correspondingly connected with the distal ends of the two driving connecting pieces; one driving connecting piece drives the corresponding cutting knife protecting plate to move towards the near end of the anastomat, and the other driving connecting piece drives the corresponding cutting knife protecting plate to move towards the far end of the anastomat, so that the two cutting knife protecting plates deflect relative to the central axis of the instrument; the near ends of the two driving connecting pieces are respectively connected with a steering mechanism; under the drive of the steering mechanism, the cutting knife guard plate, the fixed block and the actuator are driven by the driving connecting piece to rotate around the central axis of the instrument and/or deflect relative to the central axis of the instrument.

Optionally, the guide part comprises two guide plates respectively positioned on the third side and the fourth side of the central axis of the instrument, and a guide sleeve connected to the proximal ends of the two guide plates; the third side and the fourth side are not in the deflection direction of the cutting knife protection plate relative to the central shaft of the instrument;

the two driving connecting pieces are respectively positioned on the first side and the second side corresponding to the deflection direction, are respectively provided with a connecting rod and a steering pull rod which are connected, and are connected with a bogie of the steering mechanism through the steering pull rod;

the connecting rods of the two driving connecting pieces are respectively arranged between the two guide plates; the two steering pull rods are respectively arranged outside the first side and the second side of the guide sleeve and extend to the outside of the position where the guide plate is connected with the guide sleeve; an outer tube is sleeved outside the guide part.

Optionally, the pushing rack is driven by a motor to move towards the proximal end or the distal end of the anastomat.

A method for controlling any one of the above-mentioned staplers, wherein the same handle is operated, and a pushing rack is pushed by a pushing block connected with the handle to move towards the distal end of the stapler, comprising:

in the first propulsion stage, a handle is controlled, a propulsion rack is driven by a propulsion block to move a first distance to the far end of the anastomat, the propulsion rack drives a swing block to rotate around a rotating shaft to a limited position in a first direction, a swing block connecting rod and an intermediate driving part drive a pre-pressing sleeve to move to the far end of the anastomat, so that the pre-pressing sleeve reaches a set position outside the near end of the actuator, and a jaw of the actuator is closed;

in the second propulsion stage, the same handle is operated, the propulsion rack is driven by the propulsion block to move continuously to the far end of the anastomat, the swing block stops rotating in the process, the jaw of the executor is closed continuously by the pre-pressing sleeve, and the propulsion rack drives the cutter assembly to move to the far end of the executor by the firing rod.

Optionally, the control method further comprises a pull-back stage; through the reset assembly of operation anastomat, drive and impel the rack and remove to the near-end of anastomat, realize withdrawing, make and impel the rack and can drive the pendulum block again, from the limited position of pendulum block with the second direction around the rotation of axes, at this moment, impel the rack and still drive the firing bar and withdraw, the distal end of step near-end contact pre-compaction inserted sheet through firing bar circumference surface drives the pre-compaction inserted sheet and removes to the near-end of anastomat, and then draws the pre-compaction sleeve pipe through the pre-compaction ejector pin that is connected with the pre-compaction inserted sheet, make the pre-compaction sleeve pipe can follow the setting position of executor near-end outside and remove, and the keeping.

Optionally, rotation of the effector about and/or deflection relative to the instrument central axis is achieved by manipulating a steering mechanism of the stapler; in the first propulsion stage, a propulsion rack drives a swing block to rotate, so that the deflection angle of the actuator is locked while the prepressing sleeve moves to a set position to close the jaw of the actuator;

wherein, a component for locking the deflection angle is arranged at the steering mechanism; or the limiting ejector rod connected with the far end of the middle driving part is inserted into a groove corresponding to the current deflection angle at the fixed block along with the movement of the middle driving part, and the deflection angle is locked; a plurality of grooves corresponding to different deflection angles are formed in the fixed block; the fixed block drives the actuator to deflect.

Optionally, after the first propulsion stage is finished, the pre-pressing sleeve is moved away from the set position of the actuator through retraction, the jaw of the actuator is opened, and the deflection angle is unlocked;

after the deflection angle is adjusted, the first propulsion stage is executed again, the pre-pressing sleeve pipe reaches the set position of the actuator, the jaw of the actuator is closed, and the adjusted deflection angle is locked.

Optionally, the first advancing stage is a process of operating the handle for the first time to rotate the handle;

the second propulsion stage is a process of operating the handle to rotate for a plurality of times after the first time;

the rotation angle of the handle in the first rotation is larger than or equal to the rotation angle of the handle in each rotation after the first rotation.

Optionally, in the first advancing stage, a first distance for the advancing rack to move towards the distal end of the anastomat corresponds to a distance for the tilting end of the advancing block to move from the idle slot of the advancing rack to one tooth slot at the farthest end of the second rack; the lost motion slot is closer to the distal end of the push rack than the second rack;

in the second propelling stage, the tilting end of the propelling block is in the range of the second rack, and the tooth groove into which the tilting end enters is switched; in the withdrawing stage, the tilting end of the pushing block leaves the surface of the pushing rack and is not in contact with the pushing rack.

Optionally, a safety block of the stapler, upon entering the locking slot of the pusher rack, prevents the pusher rack from moving towards the distal or proximal end of the stapler; the safety block has an initial position outside the range of the pushing rack;

in the first pushing stage, when the pushing block is driven to move the pushing rack to the far end of the anastomat by controlling the handle, the safety block enters a locking groove in the range of the pushing rack from the initial position;

operating the safety button to make the safety block leave the locking groove;

in the withdrawing stage, the safety block is returned to the initial position outside the range of the pushing rack from the locking groove under the pushing of the reset sheet on the side surface of the pushing rack.

Compared with the prior art, the anastomat capable of implementing prepressing and the control method thereof have the following advantages: the invention is independently provided with the prepressing component, and effectively simplifies the structures of the prepressing component and the firing component. The invention can respectively carry out the triggering operation of the prepressing operation and the cutting anastomosis operation through the same handle; the handle is convenient for an operator to use by designing the operation sequence of the handle and adjusting the angle from the handle to the main handle.

By way of example, by operating the handle, the pre-pressing operation of the invention can also be completed synchronously with the limiting operation of locking the deflection angle. According to the invention, through resetting and withdrawing, the corresponding parts can return to the initial state or position before the prepressing and limiting operations are not executed, so that the actuator can be readjusted to a proper deflection angle, and then the handle is operated to execute the prepressing and limiting operations again, thereby avoiding misoperation in the operation, ensuring that tissues can be reliably clamped and squeezed in place, ensuring a stable nailing effect and improving the use safety of the instrument.

Drawings

Fig. 1 is a schematic view of a stapler according to the present invention.

Fig. 2 is an exploded view of a stapler according to the present invention.

Fig. 3 is a schematic view of a cutting blade guard plate provided by the present invention.

Fig. 4 is a top view of a cutting blade guard and a cutting blade guard liner provided by the present invention.

FIG. 5a is a top view of an actuator of a stapler according to the present invention in an initial state.

FIG. 5b is a top view of an actuator of the stapler of the present invention shown deflected to the right.

Fig. 6 is a top view of the pre-pressing sleeve provided by the present invention.

Fig. 7 is a schematic structural diagram of a fixing block of the stapler provided by the present invention.

Fig. 8 is a schematic view of the lower pre-pressing ejector rod of the pre-pressing sleeve provided by the invention.

Fig. 9 is a schematic view of the limiting push rod provided by the invention.

Fig. 10 is an exploded view of an embodiment of a steering mechanism of the stapler according to the present invention.

FIG. 11 is a left side view of an embodiment of a steering mechanism of the stapler provided by the present invention.

Fig. 12 is a schematic view illustrating a rotation principle of a positioning ball of the stapler according to the present invention.

Fig. 13 is a schematic view of another embodiment of a steering mechanism of the stapler provided by the present invention.

FIG. 14 is a top view of another embodiment of a steering mechanism of the stapler provided in accordance with the present invention.

FIG. 15 is a schematic view of a firing assembly of the stapler provided by the present invention.

FIG. 16 is a schematic view of a firing bar and cutting knife assembly of the stapler provided by the present invention.

Fig. 17 is an exploded view of the handle of the stapler provided by the present invention.

Fig. 18 is an exploded view of the pusher rack of the stapler provided by the present invention.

Fig. 19 is a schematic view of a sector shaped swing block and a first rack of the stapler provided by the present invention.

Fig. 20 is a schematic view of a safety button of the stapler according to the present invention.

Fig. 21 is a schematic view of a safety block of the stapler according to the present invention.

FIG. 22 is a schematic view of a handle of the stapler provided in accordance with the present invention.

FIG. 23 is a schematic view of a firing assembly attachment configuration of a stapler provided in accordance with the present invention.

Fig. 24 is a top view of a pusher rack of a stapler provided in accordance with the present invention.

FIG. 25 is a bottom view of a center tube assembly provided by the present invention.

FIG. 26 is a left side view of a center tube assembly provided by the present invention.

FIG. 27 is a schematic view of a stepped configuration of a firing bar of a stapler provided by the present invention.

FIG. 28 is a partial schematic structural view of a firing assembly of the stapler provided by the present invention.

Fig. 29 and 30 are schematic views of two types of conventional staplers, respectively.

In the figures, 1-actuator, 11-cartridge assembly, 12-staple felt assembly, 2-steering mechanism, 21-steering button, 210-steering button extension, 22-positioning catch bead, 221-barrel housing, 222-bead body, 223-positioning catch bead spring, 23-rotary block, 231-upper rotary block, 232-lower rotary block, 2310-rotary block through hole, 2311-detent projection groove, 2312-arc groove, 2313-extension groove, 232-positioning catch bead groove, 24-rotary shaft, 25-steering connecting block, 26-steering rack, 27-detent projection, 31-cutter guard, 310-cutter guard through hole, 311-cutter guard groove, 312-guard steering shaft, 313-inner wall of cutter guard, 32-fixed block, 320-fixed block body, 3200-fixed block through groove, 321-fixed block connecting piece, 3211-fixed block upper connecting piece, 3212-fixed block lower connecting piece, 32120-fixed block tooth groove, 322-fixed block groove, 33-connecting rod, 34-steering pull rod, 35-pin, 36-cutting knife guard plate lining, 37-connecting fixed plate, 4-cutting knife component, 41-knife head, 42-knife handle, 5-prepressing component, 51-prepressing sleeve, 511-front prepressing sleeve, 5110-front prepressing sleeve body, 5111-front prepressing sleeve connecting part, 512-rear prepressing sleeve, 5120-rear prepressing sleeve body, 5121-rear prepressing sleeve connecting part, 513-prepressing sleeve connecting part, 514-limiting groove, 52-prepressing ejector rod, 521-lower prepressing ejector rod, 522-upper prepressing ejector rod, 53-limiting ejector rod, 531-limiting block, 54-prepressing insert, 6-firing component, 60-position retainer, 600-position retainer spring, 601-safety button, 6010-safety button lug, 602-third spring, 603-safety block, 6030-safety block lug, 60300-safety block first groove, 60301-safety block left groove, 60302-safety block right groove, 604-fourth spring, 61-handle, 610-handle connecting piece, 611-first spring, 612-handle spring, 613-handle upper part, 614-handle lower part, 62-propelling block, 620-propelling block connecting piece, 621-second spring, 622-tilting structure, 63-a push rack, 630-a locking slot, 631-a push rack second recess, 632-a push rack tooth, 633-a push rack first recess, 634-a first rack, 635-a reset bar first through hole, 636-a push rack third recess, 635-a push rack fourth recess, 64-a sector pendulum block, 640-a sector pendulum block rotating shaft, 641-a pendulum block link connector, 65-a pendulum block link, 66-a pendulum block push rod, 67-a sleeve, 68-a firing bar sleeve, 69-a firing bar, 691-a step structure, 7-a center tube assembly, 71-an outer tube, 72-a cutting knife guide plate, 81-a reset bar, 810-a reset bar channel, 82-a reset plate, 820-a reset bevel hole, 821-a reset bar second through hole, 83-reset pin, 84-reset button, 85-reset hook, 86-reset spring, 9-central shaft.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Herein, "rear end" refers to the end closer to the operator, and "front end" refers to the end farther from the operator. The directions of "up, down, top, bottom, left and right" are all expressed by the positions shown in the corresponding drawings (as shown in fig. 2), and the directions of the components of the stapler during actual use are not limited, and the positions of "up, down, top, bottom, left and right" correspond to the directions shown in fig. 2. For ease of description, the anterior-posterior direction, e.g., the axis of the instrument central shaft 9 (which is a straight line without a solid body that extends between the proximal and distal ends of the stapler), corresponds to the X-direction; the left and right directions, such as two sides of the axis of the instrumentcentral shaft 9, correspond to the Y direction; the vertical direction, such as the axis of therotary shaft 24 of thesteering mechanism 2, corresponds to the Z direction. The "initial state" or "initial position" described herein refers to a state or position in which the respective components are each located when the pre-pressing operation is not performed by thepre-pressing sleeve 51 and the fixedblock 32 is not angularly deflected (corresponding to the central shaft 9).

As shown in FIG. 1, the anastomat with the large rotation angle disclosed by the invention comprises an executor 1 (comprising a staple feltassembly 12 and a staple cartridge assembly 11), asteering mechanism 2, a driving assembly, a cutting knife assembly 4 (shown in FIG. 2), aprepressing assembly 5, a firingassembly 6 and acentral tube assembly 7. The actuator 1, thecentral tube assembly 7, thesteering mechanism 2 and the firingassembly 6 are sequentially connected from the front end to the rear end. When not turning, the cutting knife assembly 4 is arranged on thecentral shaft 9 of the anastomat. The firingassembly 6 can be used as an input end for operations such as prepressing, limiting, cutting anastomosis and withdrawing, and transmits actions to theprepressing assembly 5, the driving assembly, the cutting knife assembly 4, the actuator 1 and the like to control respective motions of the prepressing assembly, the driving assembly, the cutting knife assembly 4 and the actuator 1. Thesteering mechanism 2 can be used as an input end of steering operation, and transmits motion to the driving assembly, the actuator 1 and the like to realize deflection and/or rotation; by rotation is meant herein a rotation of a part or assembly around acentral axis 9 within 360. Deflection in this context means that a component or assembly can swing in a plane around a point (physical or virtual) in a straight line direction, such that a reference line (e.g. axis, center line, etc.) of the component or assembly forms an angle with respect to the straight line direction; wherein the plane defining the range of oscillation will rotate as the part or assembly rotates about thecentral axis 9. The aforementioned "limit" means to lock the deflected angle. In the following embodiment, for convenience of description, the deflection is performed by swinging the fingers in the left-right direction on the plane formed by the X-axis and the Y-axis in fig. 2. After the steering operation is finished, the anastomat can further clamp, cut and anastomose the tissues; thenail bin assembly 11 and the feltassembly 12 of the actuator 1 can clamp tissues between the two, the cutter assembly 4 is driven to advance to break the tissues, simultaneously, the anastomotic nails arranged at thenail bin assembly 11 can be pushed out, the anastomotic nails are molded under the cooperation of the feltassembly 12, and the tissues are anastomosed.

As shown in fig. 2, thesteering mechanism 2 includes a steeringknob 21, arotating block 23, apositioning ball 22, a rotatingshaft 24, asteering connecting block 25 and asteering frame 26. Therotating block 23 comprises an upperrotating block 231 and a lowerrotating block 232 which are connected to each other and form a shell structure, which can fix and limit internal parts, and form a part capable of operating therotating block 23 at the rear end, so that therotating block 23 can drive parts in front of the rotating block, such as a driving assembly, apre-pressing assembly 5, a fixingblock 32, an actuator 1 and the like, to rotate around the X-direction instrumentcentral shaft 9. Theturn knob 21 is provided on theupper rotation block 231. The upperrotary block 231 is provided with a rotary block through hole 2310 (as shown in fig. 10); the rotatingshaft 24, which is located in the housing structure, is arranged in the Z direction, and has an upper end passing through the rotating block throughhole 2310 to be connected to the steeringknob 21 and a lower end connected to thesteering connecting block 25. Two steering link blocks 25 are provided, arranged in the X direction, on the left and right sides of therotary shaft 24. The turningknob 21 is turned to drive therotation shaft 24 to rotate around the Z direction, so that theturning connecting blocks 25 on the left side and the right side are staggered front and back. Preferably, thesteering connecting block 25 is provided with a convex block, and therotating shaft 24 is provided with a left through hole and a right through hole at a position extending in the X direction, which can be aligned and matched with the convex block on thesteering connecting block 25, so as to realize the connection between therotating shaft 24 and thesteering connecting block 25. The through hole can also be replaced by a groove, and the convex block can be connected with the groove in a buckling mode. The positions of the convex blocks and the through holes (or the grooves) can be interchanged. Alternatively, the rotatingshaft 24 and thesteering connecting block 25 may be integrally formed. Thebogie 26 is arranged in the X direction, and the rear end of thebogie 26 is connected to the rear end of thesteering connecting block 25.

The driving assembly comprises a driving connecting piece, a cuttingknife protecting plate 31 and a fixingblock 32. The fixingblock 32, the cuttingknife guard plate 31 and the driving connecting piece are sequentially connected from the front end to the rear end. The left and right sides of the instrumentcentral shaft 9 are respectively provided with a driving connecting piece, and the rear end of the driving connecting piece is connected with abogie 26 of thesteering mechanism 2. The driving connecting member on each side may be an integrally formed structure (substantially rod-shaped, plate-shaped or column-shaped, but not limited thereto), or may be formed by connecting a plurality of connecting sections in sequence (the adjacent connecting sections may have the same or different structures). When the driving connecting piece is arranged into a plurality of connecting sections which are connected in sequence, on one hand, the length of each connecting section is shorter, the processing process is simpler, and the strength of the instrument can be improved; on the other hand, different connecting sections can be selected to be combined and connected according to different use scenes of the anastomat, so that the anastomats with different lengths can be obtained.

In this example, the driving link at each side includes a connectingrod 33 and asteering rod 34, which are connected in sequence from the front end to the rear end, the rear end of the steeringrod 34 is connected to thebogie 26 and can be driven by thesteering mechanism 2, and when thebogies 26 at the left and right sides are staggered back and forth, the driving link moves forward or backward along with thebogie 26 at the corresponding side, so that the driving links at the left and right sides are also staggered back and forth.

As shown in fig. 2 and 3, thecutter guard plate 31 has two left and right ends, and the rear ends thereof are connected to the front ends of the drive link (in this case, the front ends of the link rods 33). Preferably, the driving assembly further comprises twopins 35, the rear end of thecutting blade guard 31 is provided with a cutting blade guard throughhole 310, and the front end of the driving connecting member is provided with a driving connecting member through hole, in this case, the driving connecting member through hole is arranged at the foremost end of the connectingrod 33. After the cutting knife guard plate throughhole 310 and the driving connecting piece through hole which are communicated in the Z direction are aligned and matched, thepin 35 penetrates through the cutting knife guard plate throughhole 310 and the driving connecting piece through hole, so that the cuttingknife guard plate 31 is connected with the driving connecting piece. The front ends of the twocutting blade guards 31 can be fixedly connected to the left and right sides of the fixingblock 32, respectively. Preferably, the left side and the right side of the fixingblock 32 are provided with fixing block grooves 322 (as shown in fig. 7), the front end of the cuttingknife guard plate 31 can be inserted into the fixingblock grooves 322 and connected with the shaft hole of the fixingblock 32, the front end of the cuttingknife guard plate 31 comprises a columnar cutting knife guardplate steering shaft 312, so that after the cuttingknife guard plate 31 is connected with the fixingblock 32, the cuttingknife guard plate 31 can rotate relative to the fixingblock 32 by using the cutting knife guardplate steering shaft 312 as the shaft center and drive the fixingblock 32 to deflect.

In this example, in a top view of the stapler, when thesteering button 21 rotates clockwise (around the Z direction) around the straight line of therotation shaft 24, that is, the front end of thesteering button 21 is deviated to the right from thecentral instrument shaft 9, and the rear end of thesteering button 21 is deviated to the left from thecentral instrument shaft 9, so as to drive therotation shaft 24 to rotate clockwise along the Z direction. Driven by thesteering mechanism 2, the driving connecting piece on the left side and the driving connecting piece on the right side are staggered front and back. Specifically, the rotatingshaft 24 drives the left steering connecting block to move towards the front end, and further sequentially pushes the left steering frame, the left steering pull rod and the left connecting rod to move towards the front end; meanwhile, the rotatingshaft 24 drives the right steering connecting block to move to the rear end, and then sequentially pulls the right bogie, the right steering linkage and the right connecting rod to move to the rear end. The drive connecting piece can drive the motion of cuttingknife backplate 31, makes cuttingknife backplate 31 drive fixedblock 32 and rotates, and fixedblock 32 deflects simultaneously. Specifically, the left driving connecting piece pushes the left cutting knife protection plate to rotate by taking the insertion part at the front end of the left cutting knife protection plate as a shaft; meanwhile, the driving connecting piece on the right side pulls the right cutting knife protection plate to rotate by taking the insertion part at the front end of the right cutting knife protection plate as an axis. Through the rotation of left cutting knife backplate and right cutting knife backplate, drive fixedblock 32 and deflect certain angle to the right side. The steeringknob 21 is rotated counterclockwise in the Z direction similarly, and the fixingblock 32 is driven to be shifted to the left by a certain angle. Preferably, the angle formed by the rotation of the turningknob 21 and thecentral shaft 9 is the same as the angle formed by the offset of the fixingblock 32 and thecentral shaft 9.

The cutting knife assembly 4 comprises aknife head 41 and aknife handle 42 connected to the rear end of theknife head 41, wherein the knife handle 42 comprises a plurality of flexible sheets which are overlapped. Preferably, the material of the flexible sheet is medical grade stainless steel. The fixingblock 32 is provided with an X-direction fixing block through groove 3200 (as shown in fig. 7), and a space is left between the two cuttingknife protection plates 31. Thetool bit 41 is positioned at the front end of the fixingblock 32, and thetool shank 42 passes through the fixing block throughgroove 3200 and the space between the two cuttingknife protection plates 31; when undeflected,tool tip 41 andtool shank 42 are both located on staplercentral axis 9. After the fixingblock 32 and the cuttingknife protection plate 31 are deflected, the knife handles 42 located between the throughgrooves 3200 of the fixing block deflect at the same angle along with the fixingblock 32, and the knife heads 41 also deflect accordingly (the knife handles 42 which do not reach the through grooves of the fixing block do not deflect). Then, the drivingfiring component 6 pushes the cutting knife component 4 to cut the tissue, and the cutting knife component 4 always moves towards the front end under the deflection angle. Thecutter head 41 moves forward and drives the nail pusher in thenail bin assembly 11 to move forward, so that the anastomotic nails are sequentially pushed out.

In some embodiments, thecutting blade guard 31 is a rigid structure. Preferably, thecutting blade guard 31 is made of medical grade stainless steel. The rigid cuttingknife protection plate 31 can enable the rotation angle of the fixingblock 32 to be more stable; when the flexible sheet (handle 42) moves between the rigid cuttingknife guard plate 31, the cuttingknife guard plate 31 can not deform due to the influence of the thrust of the flexible sheet, and the rigid cuttingknife guard plate 31 can also reduce the risk that the flexible sheet is separated from or broken due to the stress in the firing process and is extruded from the cuttingknife guard plate 31.

Preferably, thecutter guard plate 31 has an arc-shaped structure. In this example, the radius of the arc is 10 mm. The left cutting knife guard plate and the right cutting knife guard plate are opposite and are respectively concave at the inner side and convex at the outer side. When thehandle 42 of the cutting knife assembly 4 passes between the two cuttingknife guard plates 31, smooth turning can be realized by means of the arc-shaped structures of the cuttingknife guard plates 31, and the flexible sheet cannot be rebounded due to plastic deformation caused by the dead angle folding phenomenon.

As shown in fig. 4, since thecutting blade guards 31 are arc-shaped guards, there is a gap with theholder 42 between the cutting blade guards 31. Preferably, the driving assembly further comprises two cutting knifeguard plate linings 36 respectively arranged at the inner sides of the two cuttingknife guard plates 31, and the cutting knifeguard plate linings 36 are always tightly attached to two sides of theknife handle 42. Preferably, the material of the cutting blade guard plate lining 36 is medical grade stainless steel, and the thickness is designed to have certain elastic deformation capacity. The side (inner surface) of the cuttingknife guard plate 31 near thecentral shaft 9 is provided with a cutting knife guard plate groove 311 (as shown in fig. 3) matching with the cutting knife guard plate lining 36. When not deflected, the cuttingblade guard liner 36 is connected to thecutting blade guard 31 but is not disposed in the cutting blade guard recess 311 (or is not fully disposed in the cutting blade guard recess 311).

For example, when the cutting bladeguard plate liner 36 is in the initial state, the portion corresponding to the cuttingblade guard plate 31 is substantially a plane structure (such as a plate shape), and there are two corresponding portions embedded into the front and rear ends of the cutting bladeguard plate recess 311, and the liner portion between the two portions is suspended and does not contact with the cutting blade guard plate or the recess thereof. In this example, the cuttingknife guard groove 311 is through from front to back, and the cutting knife guard lining 36 is of a U-shaped structure; when thetool shank 42 is not turned, the two support legs of the U-shaped structure are in front and embedded into the front end of the groove; the middle of the U-shaped structure is embedded at the rear end of the groove; the portion of the liner between the middle and the front end is suspended with respect to thecutter guard recess 311; the middle to the rear end of the U-shaped structure extends to the rear of the guard plate and the groove thereof and is tightly attached to a section of the surface of the tool shank which does not reach the cuttingknife guard plate 31. After the U-shaped structure extends backward for a section (the maximum distance does not exceed the tail end of the cutter handle 42), the U-shaped structure is further bent outward at the rear end and embedded into the cutter guide plate to be fixed. In the U-shaped structure of the embodiment, the front sections of the two support legs are narrower, and the rear sections of the two support legs are wider; most of the width of the U-shaped opening is basically consistent with the width of the Y-direction through hole at the position of thecutter handle 42; the cutting bladeguard plate recess 311 is also correspondingly provided with two groove sections of different widths, corresponding to the width variations of the front and rear sections of the foot.

During the movement of the cutting knife assembly 4, the cuttingknife guard liner 36 can tightly attach to the shank 42 (entering the guard and entering the guard in the front section), which can reduce the risk of theshank 42 being scattered or extruded out of the cuttingknife guard 31 due to deflection. In the initial state, the fixedblock 32 is not deflected, and the cuttingblade guard liner 36 between thecutting blade guards 31 is mostly suspended relative to the cuttingblade guard recess 311 when the cutting blade assembly 4 moves back and forth along theinstrument center axis 9. When the fixingblock 32 deflects to the right (or left), the left cutting blade guard plate lining (or the right cutting blade guard plate lining) is completely embedded into the cutting bladeguard plate groove 311 on the corresponding side. As shown in fig. 5a and 5b, taking the right deflection of the fixingblock 32 as an example, the left cutting blade guard plate lining is completely embedded into the left cutting blade guard plate groove, the shank is bent to the right, and the part between the cutting bladeguard plate linings 36 protrudes to the left, so that the left side surface of theshank 42 is tightly attached to the left cutting blade guard plate lining; the right cutting knife backplate inside lining protrudes to the left, hugs closely the right flank of handle of a knife, and the front end and the rear end of right cutting knife backplate inside lining still imbed in the cutting knife backplate recess on right side simultaneously, so 4 motion in-process of cutting knife subassembly, handle of aknife 42 still can slide along the arc inner wall of left cuttingknife backplate 31 to receive the constraint of two cutting knife backplate insidelinings 36, can not scatter or extrude from cuttingknife backplate 31. In this example, the cuttingblade guard recess 311 on each side comprises two recess sections corresponding to the two legs; the protruding portion of thehandle 42 due to deflection not only directly contacts theinner wall 313 of the guard plate between the two groove sections, but also pushes the support leg of the corresponding side liner into the groove section to contact the inner surface of the liner, and the liner can transmit the acting force between the guard plate and the handle.

For filling the clearance that cutting knife subassembly 4 and cuttingknife backplate 31 exist, prevent that the parallel thin wall of a plurality of flexible pieces from scattering the problem of deformation because of the pressurized buckling, preferably, cutting knife backplate inside lining 36 is the elastic sheet, when the flexible piece scatters the deformation, the flexible piece extrudes cutting knife backplate inside lining 36 to left side and/or right side, corresponding elastic cutting knife backplate inside lining 36 of taking this moment can wholly imbed in cuttingknife backplate recess 311. Because the cuttingknife guard plate 31 is a rigid guard plate, the cutting knife guard plate lining 36 and the flexible sheet cannot be extruded from the inner force of the cuttingknife guard plate 31 under the constraint of the rigid guard plate. Thecutter guard liner 36 is deflected by thecutter guard 31, thereby acting to guide the direction of theshank 42.

Thepre-pressing assembly 5 serves as an executing end of the pre-pressing operation and is used for switching the opening or closing state of the jaw between thenail cartridge assembly 11 and the nail feltassembly 12. For example, after the effector 1 is steered to the appropriate angle, the jaws between thecartridge assembly 11 and the feltassembly 12 are closed to facilitate a subsequent cutting and stapling operation. As shown in fig. 2, thepre-pressing assembly 5 includes apre-pressing sleeve 51, and the pre-pressing operation is mainly performed through thepre-pressing sleeve 51. Thepre-pressing sleeve 51 may be sleeved at the tail end of the actuator 1, i.e. at the joint of thestaple cartridge assembly 11 and the staple feltassembly 12, and the fixingblock 32 may be completely sleeved therein. Thepre-pressing sleeve 51 in this example is a cylindrical structure that can move back and forth under the action of the firingassembly 6. When the pre-pressing operation is not carried out, the front end of thepre-pressing sleeve 51 is not contacted with the actuator 1; or only against the actuator 1, but without yet exerting pressure on the actuator 1; the actuator 1 is in an open state (open jaw between thecartridge assembly 11 and the felt assembly 12). When the prepressing operation is implemented, the firingassembly 6 is operated to push theprepressing assembly 5 to move forwards, the front end of theprepressing sleeve 51 is contacted with the actuator 1 and then continues to move forwards, the rear part of the actuator 1 is pressed down and sleeved by the advancingprepressing sleeve 51, and the jaw is changed from an opening state to a closing state. In the process of cutting anastomosis, the jaw of the actuator 1 is always in a closed state under the action of thepre-pressing sleeve 51. When the cutting anastomosis is finished, the firingassembly 6 is operated again to pull thepre-pressing sleeve 51 backwards, the jaws return to the opening state, and thepre-pressing sleeve 51 returns to the initial position.

In this example, the actuator 1 is provided with a step as a blocking mechanism, and the maximum radial dimension of the actuator 1 part behind the step is smaller than the inner diameter of thepre-pressing sleeve 51; and the minimum radial dimension of the actuator 1 at least at the position of the step is larger than the inner diameter of thepre-pressing sleeve 51 to prevent thepre-pressing sleeve 51 from further advancing (the radial direction refers to the direction perpendicular to the central axis 9). The size of the position of the actuator 1 before the step is not limited, and can be determined according to the actual application requirement. The step may be provided at the staple feltassembly 12 and or thecartridge assembly 11 of the effector 1.

In some examples, the end face of the tail end of a specific component on the actuator 1 may be used as a blocking mechanism: for example, the feltcomponent 12 includes a felt cover for covering a through slot of the felt for the movement of thestapler head 41; the felt upper cover tail end face is located in front of the tail end face of thewhole felt assembly 12, and then the felt upper cover tail end face can be used as a blocking mechanism, and when thepre-pressing sleeve 51 moves to the position, the jaw of the actuator 1 is closed. None of the above examples serve as limitations on the structure or placement position of the blocking mechanism, and other structures or components may be used to extend the radial dimension somewhere on the actuator 1 for blocking thepre-compression sleeve 51.

Preferably, as shown in fig. 6, thepre-pressing sleeve 51 includes a frontpre-pressing sleeve 511 and a rearpre-pressing sleeve 512. The frontpre-pressing sleeve 511 and the rearpre-pressing sleeve 512 move as a whole, specifically, the rearpre-pressing sleeve 512 drives the frontpre-pressing sleeve 511 under the driving of the firingassembly 6, and the frontpre-pressing sleeve 511 performs the pre-pressing function on the actuator 1. The maximum extent of forward movement of the frontpre-stressing sleeve 511 does not exceed the blocking mechanism. A certain spacing distance is kept between the frontpre-pressing sleeve 511 and the rearpre-pressing sleeve 512, and a space is reserved for the left and right deflection of the fixingblock 32 and the cuttingknife guard plate 31; the frontpre-pressing sleeve 511 and the rearpre-pressing sleeve 512 are hinged through a pre-pressingsleeve connecting piece 513, so that the frontpre-pressing sleeve 511 can rotate left and right relative to the rearpre-pressing sleeve 512; the frontpre-pressing sleeve 511 can further rotate left and right relative to the front end node connected with the pre-pressingsleeve connecting piece 513; thepre-stressed casing connector 513 may be rotated left and right with respect to its rear end node to which the rearpre-stressed casing 512 is connected.

In some embodiments, the pre-pressing sleeve includes a pre-pressing sleeve main body and a pre-pressing sleeve connection portion, the pre-pressing sleeve main body is a cylindrical structure, a rear end of the front pre-pressing sleeve main body 5110 protrudes backward along the X direction to form the front pre-pressing sleeve connection portion 5111, and a front end of the rear pre-pressing sleevemain body 5120 protrudes forward along the X direction to form the rear pre-pressingsleeve connection portion 5121; a prepressing sleeve through hole is arranged on the prepressing sleeve connecting part; thepre-pressing assembly 5 further comprises a pre-pressingsleeve connecting piece 513, the pre-pressingsleeve connecting piece 513 comprises two convex blocks, and the pre-pressing sleeve through holes are respectively matched with the convex blocks in an alignment mode and connect the frontpre-pressing sleeve 511 with the rearpre-pressing sleeve 512. The positions of the through hole of the pre-pressing sleeve and the lug can be interchanged. Preferably, twopre-pressing sleeve connectors 513 are provided, respectively disposed at the upper and lower sides of thecentral shaft 9, and the frontpre-pressing sleeve 511 and the rearpre-pressing sleeve 512 are also provided with two upper and lower pre-pressing sleeve connectors, respectively.

In the initial state, the frontpre-pressing sleeve 511 is sleeved outside the fixed block 32 (or partially sleeved outside the actuator 1 in front of the fixed block 32). The position where the driving connecting piece is connected with the cuttingknife guard plate 31 is between the front prepressing sleeve main body 5110 and the rear prepressing sleevemain body 5120, and because thefront prepressing sleeve 511 and therear prepressing sleeve 512 are hinged, the steering of the fixingblock 32 is not limited by the front/rear prepressing sleeves in this state. When thesteering mechanism 2 drives the driving assembly to move and further deflect the fixingblock 32, the frontpre-pressing sleeve 511 can deflect along with the fixingblock 32, and the position of the rearpre-pressing sleeve 512 is not changed. As thepre-compression sleeve 51 moves forward, the frontpre-compression sleeve 511 depresses the actuator 1 to close. For example, when thepre-pressing sleeve 51 advances to the farthest distance allowing the movement thereof, the foremost end of the rearpre-pressing sleeve body 5120 does not exceed the position where the fixingblock 32 is connected with the cuttingknife guard plate 31, and the fixingblock 32 is not completely sleeved therein, so that the rearpre-pressing sleeve 512 can only move back and forth along the X direction on thecentral shaft 9 all the time.

As shown in fig. 7, in some embodiments, the driving assembly further includes two connecting fixing plates 37 (shown in fig. 9) to stabilize the fixingblock 32 during steering. Twoconnection fixing plates 37 are connected to the upper and lower sides of the fixingblock 32, respectively. The fixingblock 32 includes a fixing blockmain body 320 and a fixingblock connector 321, and the fixingblock connector 321 includes a fixing blockupper connector 3211 and a fixing blocklower connector 3212. The fixed block upper connectingmember 3211 and the fixed block lower connectingmember 3212 are plate-shaped structures protruding rearward. Preferably, the upper surface of the fixing block upper connectingmember 3211 and the lower surface of the fixing block lower connectingmember 3212 are respectively provided with a fixing block protrusion, the connecting and fixingplate 37 is provided with a fixing plate through hole, and the connecting and fixingplate 37 is connected to the fixing plate through hole via the fixing block protrusion, so that the fixingblock 32 can rotate relative to the connecting and fixingplate 37. The fixingplate 37 is used to keep the fixingblock 32 stable, and when the fixingblock 32 is deflected to the left and right, the fixingplate 37 is not rotated, and the fixingplate 37 is always kept on thecentral axis 9 of the instrument. The fixingblock 32 is deflected left and right about a line on which the fixing block projection is located in the Z direction. Taking the right deflection of the fixedblock 32 as an example, the angle of the left cutting blade guard plate steering shaft rotating clockwise (from the perspective of looking down the stapler) relative to the fixed block protrusion is the same as the angle of the right cutting blade guard plate steering shaft rotating clockwise (from the perspective of looking down the stapler) relative to the fixed block protrusion. The distance that left side drive connecting piece and left cutting knife backplate go forward in X is less than the distance that right side drive connecting piece and right cutting knife backplate upwards moved back in X.

As shown in fig. 6, 8 and 9, thepre-pressing assembly 5 further includes apre-pressing post rod 52 and a limitingpost rod 53. The front end of thepre-pressing ejector rod 52 is of a T-shaped structure, and the T-shaped structure is embedded in a T-shaped groove correspondingly arranged at the rear end of the rearpre-pressing sleeve 512; through the cooperation of T type structure and T type groove, conveniently push throughpre-compaction ejector pin 52pre-compaction sleeve pipe 51 forward motion to and be difficult to throw off when firing mechanism withdraws backpre-compaction sleeve pipe 512 pulls backward throughpre-compaction ejector pin 52. Thepre-pressing ejector rods 52 comprise an upperpre-pressing ejector rod 522 and a lowerpre-pressing ejector rod 521, which are respectively positioned at the upper side and the lower side of the rear pre-pressing sleeve 512 (at least onepre-pressing ejector rod 52 has a T-shaped structure and is embedded in the T-shaped groove).

Thelimit ejector rod 53 is used as an execution end of the limit operation, and after the actuator 1 is driven by the fixedblock 32 to deflect, the actuator 1 and the fixedblock 32 are stably kept at the deflection angle, so that the deflection angle is not slightly changed due to the touch or other disturbance of the tissue structure. The limitingmandril 53 is arranged at the front end of the lower prepressing mandril 521 (the two can be fixedly connected, or only can be butted without connection to ensure the structural strength), and is positioned in the tube cavity of therear prepressing sleeve 512. Therefore, the movement of thestopper pin 53 is driven by operating thelower preload pin 521. The lowerpre-pressing ejector rod 521 has a certain thickness in the Z direction, and the front end of the lowerpre-pressing ejector rod 521 simultaneously contacts the rear end of the limitingejector rod 53 and the T-shaped groove of the rearpre-pressing sleeve 512. Theprepressing ejector rod 52 can simultaneously drive theprepressing sleeve 51 and the limitingejector rod 53 to move forwards or backwards.

A fixed block tooth socket 32120 (as shown in fig. 7) is arranged on the fixed block lower connectingpiece 3212, when the fixedblock 32 rotates to a proper angle, the firingassembly 6 is operated to control thepre-pressing ejector rod 52 to move forward, thepre-pressing ejector rod 52 pushes thepre-pressing sleeve 51 to move forward until thepre-pressing sleeve 511 reaches the position of the blocking mechanism, pre-pressing operation is completed, and the limitingejector rod 53 is pushed to move forward, so that the front end of the limiting ejector rod is inserted into the fixedblock tooth socket 32120 to complete limiting operation. A limitinggroove 514 is arranged at the front end of the T-shaped groove corresponding to the rearpre-pressing sleeve 512 along the X direction; the lower surface of the rear end of the limitingejector rod 53 extends downwards along the Z direction and is close to the lowerprepressing ejector rod 521 to form a limitingblock 531 along the X direction. The shape of the limitingblock 531 is matched with that of the limitinggroove 514, and the length of the limitingblock 531 in the X direction is shorter than that of the limitinggroove 514; the limitinggroove 514 is penetrated in the Z direction or at least the upper surface is recessed, so that a limitingblock 531 protruding in the Z direction is embedded into the limiting groove; the limitingblock 531 can slide in the limitinggroove 514 along the X direction, and plays a role in limiting the movement range and the movement direction of the limitingpush rod 53.

When the lowerpre-pressing ejector rod 521 is controlled to move forwards, the lowerpre-pressing ejector rod 521 simultaneously pushes the rearpre-pressing sleeve 512 and the limitingejector rod 53 to move forwards until the front end of the limitingejector rod 53 enters the fixedblock tooth groove 32120 to complete limiting operation, and at this time, the limitingblock 531 is allowed not to move to the foremost end of the limitinggroove 514; the frontpre-pressing sleeve 511 is restricted by the blocking mechanism, and the actuator 1 is closed to complete the pre-pressing operation. Preferably, during the advancing process, the moving distances of thepre-pressing ejector rod 52, thepre-pressing sleeve 51 and the limitingejector rod 53 are the same. When the prepressing operation and the limiting operation are released, theprepressing ejector rod 52 is controlled to move backwards, theprepressing ejector rod 52 is pulled firstly, then theprepressing sleeve 512 moves backwards, and the jaw of the actuator 1 is changed from being closed to being opened; the rearpre-pressing sleeve 512 continues to move backwards, that is, the distance between the foremost end of the limitinggroove 514 and the foremost end of the limitingblock 531 is gradually shortened until the limitingblock 531 is embedded into the foremost end of the limitinggroove 514, and the rearpre-pressing sleeve 512 drives the limitingblock 531 through the limitinggroove 514, and pulls the limitingejector rod 53 backwards to enable the limiting ejector rod to withdraw from the fixedblock tooth groove 32120. The fixedblock 32 can now be steered again by thesteering mechanism 2.

In this example, one limitingejector 53 is provided corresponding to the lowerpre-pressing ejector 521. It is understood that in other embodiments, there may be two limitingpush rods 53, including an upper limiting push rod and a lower limiting push rod, which correspond to the upperpre-pressing push rod 522 and the lowerpre-pressing push rod 521, respectively, and the twopre-pressing push rods 52 are arranged and controlled in the same manner as in this embodiment. In the embodiment with twolimit push rods 53, the fixing block upper connecting 3211 piece and the fixing block lower connectingpiece 3212 are correspondingly provided with fixing block grooves.

In some examples, the pre-pressing operation and the limiting operation are not completed simultaneously. For example, when thepre-pressing sleeve 51 reaches the set position to complete the pre-pressing operation and close the actuator 1, thelimit mandril 53 may not reach the position of the fixedblock tooth socket 32120, and the deflection of the actuator 1 is allowed to be adjusted by thesteering mechanism 2; after the adjustment is completed, the limitingpush rod 53 is pushed forward (for example, along the inner cavity of the rearpre-pressing sleeve 512 or along the groove of the inner wall of the rear pre-pressing sleeve 512) until the fixingblock tooth groove 32120 is inserted to fix the deflection angle, so as to realize the limiting operation. Or thelimit ejector rod 53 is inserted into the fixedblock tooth groove 32120, so that the deflection angle of the fixedblock 32 and the front part thereof is fixed, and the limit operation is realized; while thepre-pressing sleeve 51 is allowed to reach the set position for closing the actuator 1 at this point, so that thepre-pressing sleeve 51 can be pushed forward further until the pre-pressing operation is completed. Corresponding to the example of the present segment, the structural design at the position of the rearpre-pressing sleeve 512 needs to leave a space for the limitingejector rod 53 to move back and forth relative to the rearpre-pressing sleeve 512; the lowerpre-pressing ejector rod 521 is connected to the limitingejector rod 53 and the rearpre-pressing sleeve 512 respectively, and the lowerpre-pressing ejector rod 521 and the rear pre-pressing sleeve are driven to move in the front and rear directions and synchronously reach respective specified positions. Or, independent different parts can be used for driving the limitingmandril 53 and thepre-pressing sleeve 51 to move respectively. The structural design of asynchronous driving is not expanded in the text.

As shown in fig. 10 to 14, thesteering mechanism 2 is operated by turning asteering knob 21 of thesteering mechanism 2 when controlling other components or assemblies to perform deflection as an operation input terminal for steering operation. Apositioning ball 22 is attached to thesteering button 21. Thepositioning collision bead 22 is fixedly connected or detachably connected with thesteering button 21. The upperrotary block 231 is provided with a plurality ofpositioning ball grooves 232, and thepositioning ball 22 is placed in a selected one of thepositioning ball grooves 232. A plurality of positioning ball-contactinggrooves 232 are uniformly formed on the upper surface of the upperrotating block 231 along an arc line, which protrudes rearward. The number of the positioningcollision bead grooves 232 is odd, the positioning collision bead grooves comprise 0-degree positioning collision bead grooves corresponding to thecentral shaft 9, and when thepositioning collision beads 22 are arranged in the 0-degree positioning collision bead grooves, the steering angle of the fixingblock 32 is 0 degree; the other positioning collision bead grooves are uniformly and symmetrically arranged at the left side and the right side of the 0-degree positioning collision bead groove.

In this example, thepositioning ball 22 includes a barrel-shapedhousing 221 and a ball body 222 (in this example, a steel ball). The barrel-shapedshell 221 is sleeved outside a positioning ball spring 223 (as shown in fig. 12), the upper end of the barrel-shapedshell 221 is connected with thesteering button 21, and theball body 222 can be a spherical or hemispherical structure and is connected to one end of thepositioning ball spring 223. When thebead body 222 falls into thepositioning bead groove 232, thepositioning bead spring 223 is expanded, so that thebead body 222 can be positioned at thepositioning bead groove 232; the other end of thepositioning ball spring 223 is connected with the bottom of theturning button 21, when thepositioning ball 22 is driven by theturning button 21 to turn, theball body 222 is pressed upwards, thepositioning ball spring 223 is compressed, theball body 222 is moved into another positioning ball groove from one positioning ball groove, and then the groove changing of theball body 222 is realized.

Preferably, as shown in fig. 12, the surface of theball 222 is spherical, and when theball 222 falls into the positioningcollision bead groove 232, a gap is left between the lowest point of the bottom of theball 222 and the most concave part of the positioningcollision bead groove 232. The shape of the positioning ball-contactinggroove 232 is not limited, and when thesteering button 21 drives theball body 222 to rotate left and right, the contact portion between theball body 222 and the positioning ball-contactinggroove 232 will receive the reaction force of the positioning ball-contactinggroove 232, so that theball body 222 moves upward and pops out from the positioning ball-contactinggroove 232.

Theoretically, the central angle of the arc on which the positioningcollision bead groove 232 is located may be set to 180 ° at the maximum. When the steeringknob 21 is rotated to stagger the driving connection members forward and backward and to steer the fixedblock 32 left and right, the angle ranges of the fixedblock 32 rotated left or right along thecentral axis 9 can reach 0 to 90 degrees, respectively. However, thehandle 42 of the cutting knife assembly 4 comprises a plurality of flexible sheets, when the cutting knife assembly turns, the flexible sheets are not synchronized in dislocation and bending, the flexible turning radius of thehandle 42 is limited by design, if the turning radius is too large, namely, the angle of the fixedblock 32 rotating leftwards or rightwards is too large, thehandle 42 fails due to the buckling effect. Therefore, in practice, the central angle of the arc in which thepositioning ball groove 232 is located is generally less than 180 °.

The preferred maximum value of the central angle is set to 135 degrees in this example, namely the actuator 1 of the stapler of this example can reach a swing angle of 67.5 degrees to the left or right. In the embodiment shown in fig. 10, there are 7positioning ball grooves 232, and the arc lines corresponding to the central angle are 135 °, so that the swing angles of the stapler, which are 22.5 °, 45 °, 67.5 ° and 0 °, to the left or right can be realized. The number of the positioningcollision bead grooves 232 is adapted to the adjustable swing angle gear positions, and the adjustable swing angle degree of each gear is determined to a certain extent; of course, the number of the positioning collision bead recesses 232 also needs to be considered in consideration of the arrangement position at the upperrotary block 231.

In some embodiments, as shown in fig. 7, the fixingblock teeth 32120 are gear structures, the gear structures are uniformly arranged along an arc line, the arc line where the gear structure of the fixingblock teeth 32120 is located is the same as the arc line where the positioningcollision bead groove 232 of the upperrotating block 231 is located, the lengths of the two arc lines are the same or are enlarged or reduced in equal proportion, the teeth of the fixingblock teeth 32120 are open backwards, and the teeth are the same as and correspond to the positioningcollision bead grooves 232 of the upperrotating block 231 in number one to one. When thesteering button 21 drives the ball of thepositioning ball 22 to fall into thepositioning ball groove 232, the fixingblock 32 deflects by a corresponding angle, so that the tooth socket corresponding to thepositioning ball groove 232 is aligned with thecentral shaft 9.

In this example, as shown in fig. 10 and 11, a lockingprotrusion 27 is further disposed on a side surface of the barrel-shapedhousing 221; the top of the upperrotary block 231 is provided with an arc-shapedgroove 2312, and the positioningcollision bead grooves 232 are distributed on the top surface of the arc-shapedgroove 2312; the lockingprotrusion groove 2311 is a through groove formed in the side surface of thearc groove 2312, and the lockingprotrusion 27 is located in the lockingprotrusion groove 2311. When theball body 222 is transposed in the different positioning ball-touchinggrooves 232, the blocking-out bump 27 can correspondingly move left and right in the blocking-out bump groove 2311. When thesteering button 21 is pulled upwards, a top plate extending transversely is arranged above the clampinglug groove 2311 and at the upper part of the side surface corresponding to the arc-shapedgroove 2312, so that the clampinglug 27 can be limited from moving upwards, and thesteering button 21 can be prevented from being separated from the upperrotating block 231. In this example, thepositioning ball groove 232 is lower than the lockingprotrusion groove 2311. The catchingprotrusion groove 2311 of this example is provided on the front side surface of the arc-shapedgroove 2312, and the positioning collision bead recesses 232 are arranged behind them; in other examples, the lockingprotrusion 2311 may be disposed on the rear side of thearc groove 2312, such that each positioningcollision bead groove 232 is disposed in front of the positioning collision bead groove, and the protruding direction of the lockingprotrusion 27 needs to be adjusted accordingly. The position-limitingconvex block 27 does not limit thesteering button 21 to drive theball body 222 to move left and right between the different positioning ball-touchinggrooves 232; when thesteering button 21 is pulled upward, thedetent projection 27 can be restricted by the top plate, thereby restricting thesteering button 21 from being disengaged from theupper rotation block 231.

In the embodiment shown in fig. 13, the barrel-shapedhousing 221 is not provided with thedetent bump 27, or the barrel-shapedhousing 221 may not be provided, so that thedetent ball spring 223 of theconnection ball 222 can be completely disposed in the predetermined space inside thesteering button 21 when being expanded. Meanwhile, the lower surface of the steeringknob 21 has a downwardsteering knob extension 210, the upper surface of the upper rotary block is provided with anextension groove 2313, and theextension groove 2313 is a through groove, and thesteering knob extension 210 is disposed in theextension groove 2313. The catchingprotrusion 27 is provided at the side of thesteering button extension 210, and the catchingprotrusion groove 2311 is provided in theextension groove 2313. The order of arrangement of therotation shaft 24, thepositioning striking ball 22 and thesteering knob extension 210 on the lower surface of the steeringknob 21 is not limited, but the arrangement of therotation shaft 24, thepositioning striking ball 22 and thesteering knob extension 210 corresponds to the arrangement of the rotation block throughhole 2310, the positioning strikingball groove 232 and theextension groove 2313, respectively.

In the embodiment shown in fig. 13 and 14, therotation shaft 24, thepositioning striking ball 22 and thesteering knob extension 210 are sequentially connected to the lower portion of the steeringknob 21 from the front to the rear. Thedetent projection 27 is provided on the front side of the lower end of thesteering knob extension 210. The upperrotary block 231 is not provided with an arc-shapedgroove 2312, and positioning ball-contactinggrooves 232 for bearing thepositioning ball bodies 222 are distributed on the top surface of the upperrotary block 231 at intervals and are distributed in an arc line; the plurality of lockingprotrusion grooves 2311 are formed at the rear of thepositioning ball grooves 232 and are the same as thepositioning ball grooves 232 in number. The arc line where theextension part groove 2313 is located and the arc line where the positioningcollision bead groove 232 is located correspond to the same circle center, and the corresponding circle center angle degrees of the two arc lines are the same; because of the rearward position,extension groove 2313 is in an arc that is longer than the arc in which detentball groove 232 is located. Theextension groove 2313 of this example is lower than thepositioning ball groove 232. When thepositioning collision bead 22 falls into the positioningcollision bead groove 232, the turningknob extension 210 falls into theextension groove 2313. When thepositioning latch 22 is shifted in thepositioning latch grooves 232 under the driving of thesteering button 21, thesteering button extension 210 moves left and right in theextension groove 2313, and the lockingprotrusion 27 can also move in the lockingprotrusion groove 2311 corresponding to thepositioning latch groove 232 into which thepositioning latch 22 falls under the driving of thesteering button extension 210. Optionally, a top plate extending laterally is provided above thedetent protrusion groove 2311 to limit thedetent protrusion 27 from being pulled upward and prevent thesteering knob 21 from being disengaged from theupper rotation block 231.

If the lockingprotrusion 27 is tightly inserted into the lockingprotrusion groove 2311 and is not easily pulled out upward, a top plate extending in the transverse direction may not be additionally disposed above the lockingprotrusion groove 2311. In other examples, the protrusion direction of the catchingprotrusion 27 may be adjusted accordingly by providing the corresponding catchingprotrusion groove 2311 at the rear side of theextension part groove 2313.

In the embodiment shown in fig. 13 and 14, when the lockingprotrusion groove 2311 is not a through groove but a plurality of grooves corresponding to the positioningcollision bead grooves 232, the lockingprotrusion 27 is inserted into the lockingprotrusion groove 2311 to lock the rotation angle, and the fixingblock teeth 32120 where the position-restrictingpost 53 is inserted into the fixingblock 32 to lock the rotation angle may be provided at the same time or only one of them. The cooperation of screens lug 27 and screens luggroove 2311 can guarantee that turn to thebutton 21 when receiving ascending pulling force, is difficult to break away from the upper surface oflast turning block 231 to can make thelocation touch pearl 22 arrange in the locationtouch pearl recess 232 all the time when turning to thebutton 21 and receiving the slight touch of left and right direction. The steeringknob 21 is not slightly disturbed in the left-right direction due to the catchingprojection 27, and therotary shaft 24, thesteering link block 25, thebogie 26, the driving link, thecutter guard plate 31 and the fixingblock 32, which are connected to the steeringknob 21 in this order, are not slightly disturbed in the left-right direction. Therefore, after the actuator 1 is driven by the fixingblock 32 to deflect to a certain angle, even if the left side and the right side of the actuator 1 touch human tissues or organs, the deflection angle of the actuator 1 cannot be changed. Meanwhile, when the operator rotates thesteering button 21, the lockingprotrusion 27 and the lockingprotrusion groove 2311 are designed to be matched, so that the steering is not hindered due to too tight matching.

Although the lockingprotrusion groove 2311 is a through groove in the embodiment shown in fig. 10 as described above, and the lockingprotrusion 27 is engaged with the lockingprotrusion groove 2311 to limit the upward movement of thesteering button 21 from the surface of the upperrotating block 231, it is understood that the lockingprotrusion groove 2311 may be provided with a plurality of grooves as shown in fig. 14 to replace thestopper 53.

In addition, although the structure of fig. 10 and 13 is taken as an example, the arc lines (the arc-shaped grooves 2312) of the positioning collision bead recesses 232 are recessed from the front side and protruded from the rear side, and are located behind the rotatingshaft 24, so that when the front end of the turningknob 21 is pulled to the left or right, the shifting direction of thebead body 222 is reversed, i.e., the positioning collision bead recesses 232 to the right or left are shifted. However, it is understood that in other embodiments, the arc line (the arc groove 2312) of the positioningcollision bead groove 232 may be reversed to protrude forward and be recessed backward, and be located in front of therotation shaft 24, and the position of thepositioning collision bead 22 is adjusted accordingly, so that when the front end of thesteering button 21 is pulled leftward or rightward, the shifting direction of thebead body 222 may be consistent, and the positioningcollision bead groove 232 may be shifted to the left or right.

The firingassembly 6 is also used as an action input end of prepressing operation, limiting operation, cutting anastomosis operation and withdrawing operation, and drives other corresponding assemblies to execute corresponding operations. As seen in fig. 15, 16, the firingassembly 6 includes a firing assembly housing, ahandle 61, apusher block 62, and apusher rack 63. The firing assembly housing is located behind therotating block 23. The shell of the firing assembly is of a shell structure and can fix and limit internal parts. One end of thehandle 61 is connected to the inside of the firing assembly shell, and the other end is arranged outside the firing assembly shell and used as a part for the operator to hold and operate. The upper end of thehandle 61 is connected with a pushingblock 62, and a pushingrack 63 is positioned above the pushingblock 62. The control handle 61 drives the pushingblock 62, the pushingblock 62 is used for pushing the pushingrack 63, the pushingrack 63 pushes the corresponding component, the action is firstly transmitted to thepre-pressing component 5, and pre-pressing operation and limiting operation are executed; then the action is transmitted to the cutter assembly 4 to execute the cutting and anastomosis operation. As shown in fig. 18, the lower surface of thepush rack 63 is provided with a lockinggroove 630, a push racksecond groove 631, and push rack teeth 632 (described in detail below) in order from the front end to the rear end, and the upper surface of thepush rack 63 is provided with a push rackfirst groove 633.

In this example, thehandle 61 has a hollow ring structure, so that the handle can be pushed through the ring structure to press thehandle 61. Preferably, the firing assembly housing is shaped to approximate a magazine, and in an initial state, the hand-held portion forms an angle with the firing assembly housing.

As shown in FIGS. 17 and 22, a fixedly attachedhandle link 610 is provided within the firing assembly housing for connecting thehandle 61 to the firingassembly 6. Preferably, thehandle link 610 is a cylindrical structure (e.g., arranged in a left-right direction) within the firing assembly housing, and thehandle 61 is hingedly attached to thehandle link 610. Thehandle connector 610 is provided with a first spring 611 (preferably a torsion spring), thefirst spring 611 is arranged in thehandle 61, a first section extending from the body of thefirst spring 611 is connected or contacted with thehandle 61, and a second section of thefirst spring 611 is connected or contacted with a pushingblock 62. Pressing thehandle 61, thefirst spring 611 is pressed, thehandle 61 moves counterclockwise (to face the direction of fig. 15) with the handle connector as the axis, the first section of the spring is pressed, and thefirst spring 611 stores the force; thehandle 61 is released, and thehandle 61 is restored by the elastic force of thefirst spring 611.

Disposed within the firing assembly housing is apusher block 62 and apusher block linkage 620. Thepusher block coupling 620 is disposed at the uppermost end of thehandle 61 and preferably has a cylindrical configuration for coupling thehandle 61 to thepusher block 62 and for coupling thepusher block 62 to the firing assembly housing. The pushingblock connecting piece 620 is fixedly connected with thehandle 61 and the pushingblock 62 respectively. Thepusher block connector 620 further comprises a second spring 621 (preferably another torsion spring) fixed to thepusher block connector 620, wherein a first section extending from thesecond spring 621 is located inside thepusher block 62 and abuts against the inside of the upper surface of thepusher block 62. The firing assembly includes apush rack 63, and a section ofpush rack teeth 632 is disposed on the lower surface of thepush rack 63. The pushingrack 63 is arranged above the pushingblock 62, and the front end of the pushingblock 62 comprises anupward tilting structure 622; under the action of the first section of thesecond spring 621, the propellingblock 62 has a tendency of tilting upwards, a reinforcing rib is arranged at a proper position in the housing of the firing assembly, the rotation of the propellingblock 62 is limited at the rear end thereof, and the propellingblock 62 has a tendency of pressing downwards; in the initial state, thesecond spring 621 has accumulated power, and the tiltingstructure 622 of the pushingblock 62 is maintained at a position not contacting the pushingrack 63.

The second section extending from the second spring body is located inside thehandle 61 and abuts against the inside of the front side of thehandle 61. When thehandle 61 is pressed down, thehandle 61 drives the pushingblock connecting piece 620 to move counterclockwise (in the direction facing to fig. 15) by taking thehandle 61 as an axis, at this time, thehandle 61 presses down the second section of thesecond spring 621 to enable thesecond spring 621 to release the stored force, the pushingblock 62 is pushed by the first section of thesecond spring 621, the pushingblock 62 moves clockwise (in the direction facing to fig. 15) around the pushingblock connecting piece 620, the tiltingstructure 622 of the pushingblock 62 is pushed into the position contacting with the tooth socket of the pushingrack 63, and the pushingrack 63 moves forward.

Thehandle 61 is released, and thehandle 61 returns to the original position under the action of thefirst spring 611; thepusher block 62 rotates clockwise until it is stopped by the rear stiffener and pressed down, and then moves counterclockwise (in the direction facing fig. 15) about thepusher block connector 620, returning thepusher block 62 to its original position and exiting the current tooth slot; because the front side of the pushingrack teeth 632 is an inclined surface, when the pushingblock 62 rotates counterclockwise, the tiltingstructure 622 cannot drive the pushingrack 63, and at this time, the pushingrack 63 is not moved. Ashandle 61 is operated,kickup structure 622 ofpusher block 62 sequentially falls into the respective gullets ofpusher rack teeth 632 ranging from the forwardmost gullet to the rearwardmost gullet. Each time thehandle 61 is pressed down, the tiltingstructure 622 pulls the pushingrack 63 forward once and disengages from the current tooth socket; thehandle 61 is released and the cockingstructure 622 enters a tooth slot in the rear end so that theadvance rack 63 is pushed forward a distance (corresponding to one or more tooth slots) each time thehandle 61 is depressed and released.

As shown in fig. 18 and fig. 19 (one side of fig. 19 is a cross section), the upper surface of the pushingrack 63 has a pushing rackfirst groove 633, the pushing rackfirst groove 633 includes a section offirst rack 634, and the tooth space of thefirst rack 634 faces upward. A sector-shapedswing block 64 is arranged above thefirst rack 634, the arc-shaped surface of the sector-shapedswing block 64 is in a gear structure, and the gear teeth of the sector-shaped swing block face downwards to be meshed with the tooth grooves of thefirst rack 634. The firing assembly housing includes a sector shaped pendulum rotation axis 640 (e.g., disposed in a left-right orientation) for coupling the sector shapedpendulum 64 within the firing assembly housing and rotating the sector shapedpendulum 64 about the sector shapedpendulum rotation axis 640. The sector pendulumblock rotating shaft 640 is fixedly connected in the firing assembly housing.

As shown in fig. 15, 18 and 19, a swingblock connecting member 641 is respectively provided at the left and right sides of thesector swing block 64 and hinged to thesector swing block 64 itself or the sector swingblock rotating shaft 640, and the other end of the swingblock connecting member 641 is respectively hinged to a swingblock connecting rod 65. Preferably, the swing block connectingrod connecting member 641 and the fan-shaped swingblock rotating shaft 640 are connected through a shaft hole, a Y-protruding shaft is disposed on the swingblock connecting member 641 and penetrates into a hole at the rear end of the swingblock connecting rod 65 to realize hinging, and the hole is a waist-shaped hole to provide a section of moving space for the swing block connectingrod connecting member 641. The swingblock connecting rods 65 are arranged on the left side and the right side of the pushingrack 63, and the front ends of the swingblock connecting rods 65 are respectively hinged with a swingblock push rod 66. In the initial state, the swingblock connecting rod 65 forms a first included angle a with the instrumentcentral shaft 9, and the opening direction of the first included angle a points to the rear end; thependulum push rod 66 is always parallel to the instrumentcentral axis 9. The number of teeth on the sector-shapedswinging block 64 does not exceed the number of tooth grooves of thefirst rack 634. In the initial state, the teeth (or tooth grooves) at the foremost end of the sector-shapedswing block 64 are engaged with the teeth (or tooth grooves) at the foremost end of thefirst rack 634. When the pushingrack 63 is pushed forward, thefirst rack 634 in thefirst groove 633 of the pushing rack moves forward, and the sector-shapedswing block 64 engaged with thefirst rack 634 is driven to rotate clockwise (in the direction facing fig. 15) around the sector-shaped swingblock rotating shaft 640, and simultaneously drives the sector-shaped swingblock rotating shaft 640 and the swingblock connecting rod 641 to rotate clockwise (in the direction facing fig. 15). In this example, the sector shapedswing block 64, the sector shaped swingblock rotation shaft 640, and the swing blocklink connection member 641 are integrally formed. The swing block connectingrod connecting part 641 drives the swingblock push rod 66 to move forwards through the swingblock connecting rod 65. As thepush rack 63 continues to be pushed forward, the angle between therocker link 65 and the instrumentcentral shaft 9 gradually decreases. The firingassembly 6 further includes asleeve 67 and a firingbar sleeve 68. The swingblock push rod 66, thesleeve 67 and the firingrod sleeve 68 are sequentially connected from back to front, the firingrod sleeve 68 is connected with thepre-pressing insertion piece 54 at the rear end of thepre-pressing ejector rod 52, thesleeve 67 is pushed forwards through the swingblock push rod 66, and then the firingrod sleeve 68, thepre-pressing ejector rod 52 and the limitingejector rod 53 are driven to advance.

After the pushingrack 63 advances to a tooth (or tooth socket) in thefirst rack 634 to engage with a tooth socket (or tooth socket) at the rearmost end of the fan-shapedswing block 64, the pushingrack 63 is pushed forward continuously, the fan-shapedswing block 64 is separated from thefirst rack 634, and at this time, the included angle between the swingblock connecting rod 65 and the instrumentcentral shaft 9 is minimum. Thepre-pressing sleeve 51 is pushed to the blocking mechanism to complete the pre-pressing operation, and the actuator 1 is opened to be completely closed; thelimit post 53 is inserted into the fixedblock tooth groove 32120 of the fixedblock 32, completing the limit operation. Then the pushingrack 63 is pushed again, and the components which are connected with the sector-shapedswinging block 64 in sequence and can be driven by the sector-shapedswinging block 64 do not move forward any more.

Preferably, after the sector-shapedswing block 64 is separated from thefirst rack 634, some parts connected with or driven by the sector-shapedswing block 64, such as the swingblock connecting rod 65 or the swingblock push rod 66, will be in a tightened state, and slightly deform, so that the linear swingblock connecting rod 65 or the swingblock push rod 66 is moderately bent, so that the pushedpre-pressing ejector rod 52 and thelimit ejector rod 53 are in a tightened state under the action of the swingblock connecting rod 65 or the swingblock push rod 66, and the risk that the jaw of the actuator 1 is opened due to the backward movement of thepre-pressing sleeve 51 and the fixedblock 32 moves left and right due to the backward movement of thelimit ejector rod 53 in the operation is reduced.

Preferably, a second included angle b is formed between the sector-shapedswing block 64 and the swingblock connecting rod 65; a connecting line from the hinged position of thesector swing block 64 and the swingblock connecting rod 65 to the sector swingblock rotating shaft 640, and an included angle formed between thesector swing block 64 and the swingblock connecting rod 65 is the second included angle b; when the pushing rack moves towards the proximal end or the distal end of the anastomat and drives the sector-shapedswinging block 64 to rotate, the angle of the second included angle b is reduced or enlarged. When the pre-pressing and limiting operations are not completed, the second included angle is an acute angle with the opening facing forwards (currently shown in fig. 28); in the process of pre-pressing and limiting, the second included angle is adjusted to be an obtuse angle with a forward opening; continuously impelrack 63 drives fan-shapedpendulum block 64 and continuously rotates, makes the second contained angle from the forward obtuse angle of opening, adjusts to the straight angle to the second contained angle, and the second contained angle adjustment is the rearward obtuse angle of opening again, and pendulumblock connecting rod 65 contacts the limit point that sets up in the firing subassembly shell this moment, with fan-shapedpendulum block 64's rotation locking, forms the dead state of lock. The sector shapedrocker 64, when rotated to the maximum allowable swing angle, is stopped from further rotation by a ramp provided in the firing assembly housing. Thereafter, thepush rack 63 is not affected and can continue to move forward without the sector shapedswing block 64 rotating therewith.

In this example, the firingbar sleeve 68 and thepre-loaded push rod 52 are connected by a pair of pre-loaded tabs 54 (shown in FIG. 25). Thepre-pressing insertion piece 54 is a sheet structure, and is partially or completely embedded into the left and right sides of the firingbar sleeve 68, near the front end of the firingbar sleeve 68. The upper end and the lower end of eachprepressing insert 54 are respectively connected to the rear ends of the same side (left side or right side) of the twoprepressing push rods 52. Firingbar sleeve 68 is driven throughpre-compression tab 54 topre-compression ram 52.

As shown in FIG. 16, the firingassembly 6 further includes a firingbar 69, which may be formed of a single piece or may be assembled in multiple pieces. The front end of the firingrod 69 is connected with the cutting knife component 4, and the rear end is connected with the pushingrack 63. The firingbar 69 is disposed in thesleeve 67 and the firingbar sleeve 68, and when the firingbar sleeve 68 rotates along with thesleeve 67, the firingbar 69 and the cutting knife assembly 4 are driven to rotate around thecentral shaft 9. When the sector-shapedrocker 64 is disengaged from thefirst rack 634, thehandle 61 is again depressed and released, the pushingrack 63 continues to move forward, which in turn pushes the firingbar 69 and the cutting blade assembly 4 forward, and the cuttinghead 41 begins to cut the tissue held in the effector 1. When the cuttinghead 41 of the cutting knife assembly 4 is run to the foremost end of the actuator 1, the cutting of the tissue is completed.

As shown in fig. 17, 20, 21, the firingassembly 6 further includes asafety button 601, a third spring 602 (preferably a compression spring), and asafety block 603. Thesafety button 601 is a cylindrical structure disposed within the firing assembly housing (e.g., in a side-to-side arrangement) and is at least partially exposed outside of the firing assembly housing. In this example, the left and right ends of thesafety button 601 each include a section that is exposed outside of the firing assembly housing. Thesafety block 603 is provided on the front side of thesafety button 601. The lower end of thesafety block 603 extends backwards to form asafety block bump 6030; the front end of thesafety button 601 extends forward to form asafety button projection 6010. Thesafety button projection 6010 is located above thesafety block projection 6030. The upper surface of the safetyblock protruding block 6030 is provided with a firstsafety block groove 60300, a leftsafety block groove 60301 and a rightsafety block groove 60302 which are respectively located on the left side and the right side of the firstsafety block groove 60300. The lower end of thesafety button projection 6010 protrudes downward, and in this example, the section of thesafety button projection 6010 on the plane formed by the Y axis and the Z axis is a diamond shape. The protruding shape of the lower end of thesafety button projection 6010 is matched with the firstsafety block groove 60300, the leftsafety block groove 60301 and the rightsafety block groove 60302. Thethird spring 602 fits over thecylindrical safety button 601 and is located within the firing assembly housing. In this example, thethird spring 602 includes two segments, which are respectively disposed on the left and right sides of thesafety button 601. The upper surface of thesafety block 603 is an inclined surface extending backward from the upper end to the lower end, and in the initial state, the inclined surface abuts against the top edge connecting the front side surface and the lower surface of thepush rack 63, and the protrusion of the lower end of thesafety button projection 6010 corresponds to thefirst groove 60300 of the safety block, but is isolated from thefirst groove 60300 of the safety block. Grasping thehandle 61 advances thepusher rack 63 and thesafety block 603 is depressed in the Y direction. The lower surface of thepush rack 63 is provided with a lockinggroove 630, and the lockinggroove 630 is located in front of the teeth of the lower surface of thepush rack 63. The shape of the lockinggroove 630 is adapted to the shape of the upper end of thesafety block 603. In this example, the upper surface of thesafety block 603 is a slope inclined toward the rear end, so the lockinggroove 630 also includes a slope inclined toward the rear. Thehandle 61 is held, therack 63 is pushed forward, and the position of thesafety block 603 in the X direction is kept unchanged; when thehandle 61 is released, the upper end of thesafety block 603 is inserted into the lockinggroove 630, and the instrument is in a locking state, namely, the pushingrack 63 cannot be pushed forwards by holding thehandle 61 again, and thehandle 61 has great resistance and is difficult to pull. When the upper end of thesafety block 603 is embedded into the lockinggroove 630, thesafety block 603 moves upward along the Z direction relative to the initial position, so that the lower end of thesafety button projection 6010 falls into thefirst groove 60300 of the safety block, correspondingly, the sector-shapedswing block 64 is separated from thefirst rack 634, the swing angle of the sector-shapedswing block 64 is maximized, and the pre-pressing operation and the limiting operation are both completed. At this time, the operator can check whether the angle of the actuator 1 is appropriate. If the angle is proper, thepre-pressing sleeve 51 and the limitingejector rod 53 are accurately in place, the actuator 1 is closed, unlocking operation is carried out, and thesafety button 601 is pushed inwards along the Y direction to be exposed at the left side (or the right side) of the excitation shell.

Taking the example of pushing thesafety button 601 to the right, the lower end of thesafety button projection 6010 is disengaged from the safety blockfirst recess 60300 and falls into the safety blockright recess 60302, and the rightthird spring 602 is compressed; the lowest point of the rightsafety block groove 60302 is higher in the Z direction than the lowest point of the firstsafety block groove 60300, after thesafety button projection 6010 moves, thesafety block 603 is pressed in the Z direction, the upper end of thesafety block 603 at least partially escapes from the lockinggroove 630, thesafety block 603 no longer limits the forward movement of the pushingrack 63, and the instrument is unlocked. Then, thehandle 61 is pressed and loosened again, the pushingrack 63 moves forward, the upper end of thesafety block 603 is pressed downwards by the top edge formed by the rear side surface of the lockinggroove 630 and the lower surface of the pushingrack 63, thesafety block 603 moves downwards, theright groove 60302 of the safety block is separated from the lower end of thesafety button projection 6010, thesafety button 601 moves leftwards under the elastic force of thethird spring 602 on the right side, the initial position is returned, and the lower end of thesafety button projection 6010 corresponds to thefirst groove 60300 of the safety block. Preferably, the upper end of thesafety block 603 is shaped to correspond to the tooth space of the pushingrack teeth 632 behind the lockinggroove 630, and the depth of the tooth space of the pushingrack teeth 632 does not allow the inclined surface of the upper end of thesafety block 603 to be completely inserted into the tooth space, so that thesafety block 603 is in contact with the pushingrack 63 and does not prevent the forward movement of the cutting blade assembly 4 when the locking state is released and the pushingrack 63 pushes the cutting blade assembly 4 forward.

A fourth spring 604 (preferably a torsion spring) having one extension attached to the upper portion of thesafety block 603 and the other extension secured to a suitable location within the firing assembly housing is released when thesafety block 603 moves downward out of contact with thepush rack 63 and releases thesafety button 601 when it is not in contact with the locking block, allowing the upper end of thesafety block 603 to continue to contact thepush rack 63 by restoring thesafety block 603 to its original position with the force of the spring.

As shown in fig. 18, a position between the lockinggroove 630 and the pushingrack teeth 632 on the lower surface of the pushingrack 63 includes a pushing rack second groove 631 (idle groove). In the initial state, the tiltingstructure 622 of thepush block 62 corresponds to the push racksecond groove 631. The swing angle from the first time of holding thehandle 61 to thehandle 61 is the largest, i.e. holding thehandle 61 to thehandle 61 butts against the front side of the magazine structure, thesecond groove 631 of the push rack is pushed fully to the front of thepush block 62. When thehandle 61 is released, the tilted structure of the pushingblock 62 enters the first tooth groove at the foremost end of the pushingrack teeth 632.

As previously described, the operator first grasps thehandle 61 and reaches it all at once until thehandle 61 is restrained by the magazine structure when using the stapler of the present invention. After thehandle 61 is loosened, the upper end of thesafety block 603 enters the lockinggroove 630, the tiltingstructure 622 enters the tooth groove at the foremost end of the pushingrack teeth 632, and the fan-shapedswing block 64 is separated from thefirst rack 634; thesector swing block 64 sequentially pushes the swing block connectingrod connecting piece 641, the swingblock connecting rod 65, the swingblock push rod 66, thesleeve 67, the firingrod sleeve 68, thepre-pressing ejector rod 52 and the limitingejector rod 53 to move; thepre-pressing sleeve 51 is limited by the blocking mechanism, the actuator 1 is closed, and the tissue is pre-pressed before the cutting anastomosis is finished; thelimit post 53 is inserted into the fixingblock tooth groove 32120 of the fixingblock 32 to limit the fixingblock 32. From the second grasping of thehandle 61, each time thehandle 61 is grasped, the pushingblock 62 pushes the pushingrack 63 forward, and thecutter head 41 cuts the tissue while the tissue is stapled by the staples.

The firingassembly 6 further includes a reset assembly that includes areset rod 81, areset plate 82, and areset pin 83. Thereset rod 81 is a pull rod for retracting the pushingrack 63, and thereset rod 81 is arranged in the firing assembly housing (for example, arranged in the left-right direction) and at least partially exposed outside the firing assembly housing; preferably, the portion of thereset lever 81 exposed outside of the firing assembly housing is sleeved with a reset button 84 (shown in FIG. 1), and the retraction operation is performed by pulling on thereset button 84.

The firing assembly housing is provided with a reset rod channel 810 (shown in fig. 1) for thereset rod 81 to move back and forth, and thereset rod channel 810 is arranged along the X direction and is parallel to the pushingrack 63. During the forward movement of thepush rack 63, thereset lever 81 moves forward along thereset lever passage 810. The length of thereset lever channel 810 is longer than or equal to the total length of the pushing racksecond groove 631 and the pushingrack teeth 632 such that the length of thereset lever channel 810 does not limit the range of motion of the pushingrack 63.

Thereset plate 82 is connected to the side of thepush rack 63 by areset pin 83. The foremost end of thereset piece 82 exceeds the position of the lockinggroove 630, and thereset piece 82 is provided with a notch with the shape approximately the same as that of the lockinggroove 630 corresponding to the position of the lockinggroove 630 of the pushingrack 63, so that after thesafety block 603 enters the lockinggroove 630, thereset piece 82 does not generate downward pressure on thesafety block 603. Thereset sheet 82 is provided with a reset inclinedhole 820 inclined backward, and the upper end of the reset inclinedhole 820 points to the front and the lower end points to the back. In the initial state, the lower end of thereset plate 82 is not lower than the lower surface of thepush rack 63, and thereset pin 83 fixed to thepush rack 63 is disposed at the lower end of the reset inclined hole 820 (i.e., the lowest point of the reset inclined hole 820).

Thereset lever 81 passes through thereset plate 82 and the rear end of thepush rack 63 in turn. The pushingrack 63 is provided with a first throughhole 635 for thereset rod 81 to pass through, and the first throughhole 635 has a certain length in the X direction.Reset plate 82 is provided with a second reset rod throughhole 821 forreset rod 81 to pass through, and reset rod second throughhole 821 has a certain length in the Z direction. In the initial state, thereset lever 81 is disposed at the foremost end of the reset lever first throughhole 635 and at the lowermost end of the reset lever second throughhole 821.

After thehandle 61 is pressed and loosened for the first time, if the angle of the actuator 1 is not proper, or thepre-pressing sleeve 51 and the limitingejector rod 53 are not accurately in place, or the actuator 1 is not completely closed, the retracting operation is performed. At this time, the upper end of thesafety block 603 is fitted into the lockinggroove 630, and thesafety block 603 is wider than the lockinggroove 630 in the Y direction, that is, thesafety block 603 protrudes right and left in the Y direction with respect to thepush rack 63 including thereset piece 82. Thereset rod 81 is pulled backwards, and because thereset rod 81 is arranged at the foremost end of the first throughhole 635 of the reset rod, thereset rod 81 moves in the space in the X direction along the first throughhole 635 of the reset rod, so that thereset rod 81 drives thereset piece 82 to move, and does not drive thepush rack 63 to move. Thereset pin 83 fixed to thepush rack 63 does not move. The direction of movement of thereset plate 82 is limited by thereset pin 83 and thereset ramp hole 820. Thereset plate 82 moves relative to thereset pin 83, and thereset pin 83 contacts the lower end of the reset inclinedhole 820, and then thereset pin 83 contacts the upper end of the reset inclinedhole 820, which corresponds to the reset inclinedhole 820 of thereset plate 82 moving downward and backward along thereset pin 83. The direction of movement of thereset plate 82 can be broken down into a downward movement and a rearward movement. Thereset plate 82 moves downward until the lower end thereof touches the upper end of thesafety block 603; thereset plate 82 continues to move downwards, the lower end of the reset plate presses thesafety block 603 downwards, thesafety block 603 is separated from the pushingrack 63, thereset plate 82 moves downwards to drive the second reset rod throughhole 821 on thereset plate 82 to move downwards, thereset rod 81 moving backwards is driven, thereset plate 82 moves upwards relatively, and thereset rod 81 moves to the uppermost end from the lowest end of the second reset rod throughhole 821. Thereset lever 81 moves backward until thereset lever 81 contacts the rearmost end of the reset lever first throughhole 635, thesafety block 603 is completely pressed down, is released from the lockinggroove 630, and the locking state is released; thereset rod 81 continues to move backward, and can simultaneously drive thereset piece 82 and thepush rack 63 to move backward until the initial state is reached. After the retraction operation is completed, all the structures of the instrument are fully returned to the initial position. The steeringknob 21 can now be operated again to adjust the instrument angle.

After the first depression-release of thehandle 61 to move the instrument to the proper position, continued depression-release of thehandle 61 causes movement of the cutting blade assembly 4, primarily through the firingassembly 6. Thereafter, each time thehandle 61 is pressed and released, thepush rack 63 is pushed forward by thepush block 62 for a distance. The distance that thepush rack 63 moves forward can be controlled by the range of movement of thehandle 61 after thehandle 61 is pressed. For example, by pressing down on thehandle 61, thehandle 61 is rotated counterclockwise by a small angle, and the pushingrack 63 is pushed forward by the pushingblock 62 by a distance of the tooth gap of the pushingrack teeth 632; thehandle 61 is loosened, and the tilting structure of the pushingblock 62 enters the tooth groove of the next pushingrack tooth 632; or, thehandle 61 is pressed down, so that thehandle 61 rotates counterclockwise by a larger angle, and the pushingrack 63 is pushed forward by the pushingblock 62 by the distance of at least two tooth grooves of the pushingrack teeth 632; by releasing thehandle 61, the tilted structure of the pushingblock 62 enters the tooth grooves of at least two pushingrack teeth 632 backward. However, the maximum distance that the pushingrack 63 moves forward once is not more than the distance that the pushingrack 63 moves forward when thehandle 61 is pressed for the first time, i.e., when the pre-pressing operation and the limiting operation are performed by the firingassembly 6. Preferably, the shape of the tooth slot of thedriving rack teeth 632 is adapted to the shape of the upper end of thesafety block 603, so that the tilting structure of the drivingblock 62 enters a certain tooth slot, and simultaneously the upper end of thesafety block 603 enters the tooth slot located in front of the tooth slot.

In some embodiments, such as when the cutting-head 41 is blocked by a foreign object in the tissue during the advancement, a greater grip must be provided to continue advancing the cutting-head 41, but an excessive grip may cause damage to the stapler, and thus, in order to prevent thehandle 61 from receiving an excessive grip, the firingassembly 6 may be provided with an overload protection function. As shown in fig. 22, thehandle 61 is provided in two segments, including a handleupper portion 613 and a handlelower portion 614, which are hinged at their rear ends and connected at their front ends by ahandle spring 612; preferably, thehandle spring 612 is provided inside thehandle 61. In the initial state, the lower end of the handleupper portion 613 and the upper end of the handlelower portion 614 are in contact with each other. The upper end of theupper handle portion 613 is connected to thepusher block 62 and thelower handle portion 614 comprises a ring-shaped structure for the operator to hold. When the handle is pressed in the counterclockwise direction, the holding force is transmitted from thelower handle portion 614, thehandle spring 612 to theupper handle portion 613, which is not enough to make thehandle spring 612 to stretch and accumulate the force, so thelower handle portion 614 drives theupper handle portion 613 to rotate counterclockwise through thehandle spring 612, so that theupper handle portion 613 and thelower handle portion 614 are kept stationary during the movement, which is similar to the movement when the handle is made into an integral structure. When the grip is too large, the grip is transmitted from thelower handle portion 614 to thehandle spring 612, and thehandle spring 612 is stretched and accumulated under the effect of the too large grip, so that the portion of the grip capable of being transmitted to theupper handle portion 613 is not enough to drive the pushingblock 62 to push the pushingrack 63 to advance, and the stapler is in a force unloading state. After the cutter assembly 4 is retracted to a proper position by performing a retracting operation (described in detail below) when entering the force-releasing state, the cutting and stapling operation is performed again. Preferably, a mechanical sensor may be installed at a connection between theupper handle portion 613 and thelower handle portion 614, when thelower handle portion 614 is held, a mechanical signal is transmitted to the processing unit, the processing unit determines whether the grip strength value exceeds a set range, and when the grip strength is too large, the operator is reminded of the grip strength by emitting a prompt sound or blinking a prompt light within a visual range of the operator.

As shown in fig. 18 and 23, the cutting process is ended when the cutting blade assembly 4 is moved to the foremost end within its range of motion. Thereset rod 81 is retracted to the rear end along thereset rod channel 810, thereset sheet 82 is driven to move towards the rear lower side, and thereset sheet 82 presses thesafety block 603 down to enable the uppermost end of thesafety block 603 to be far away from the lower surface of the pushingrack 63. The pushingrack 63 is driven to move to the rear end, and the firingrod 69 and the cutting knife assembly 4 are driven to move backwards together. The withdrawing is continued until the teeth (or the tooth grooves) of the rearmost end of the sector-shapedswing block 64 are re-engaged with the tooth grooves (or the teeth) of thefirst rack 634 of the upper surface of thepush rack 63, and since thesafety block 603 has been pressed down by thereset piece 82, thesafety block 603 is not inserted into the lockinggroove 630 any more, and the withdrawing of thepush rack 63 is not restricted. Continuing to pull thereset rod 81, pushing therack 63 to sequentially drive thefirst rack 634 and thesector swing block 64, and further sequentially driving the swingblock connecting rod 65, the swingblock push rod 66, thesleeve 67, thetrigger rod sleeve 68, thepre-pressing insertion piece 54, thepre-pressing ejector rod 52 and the limitingejector rod 53 to move backwards, so that the limitingejector rod 53 is separated from the groove structure of the fixedblock 32; when thepre-pressing push rod 52 moves backward, thepre-pressing sleeve 51 is driven to move backward integrally, so that thepre-pressing sleeve 51 returns to the initial position, and the jaw of the actuator 1 is opened again. In the process of withdrawing, the tiltingstructure 622 of the pushingblock 62 is not in contact with the pushingrack 63, because when thehandle 61 is completely reset, the rear end of the pushingblock 62 is in contact with the end surfaces of the two reinforcing ribs at corresponding positions in the housing of the firing assembly, due to the effect of thefirst spring 611, the pushingblock 62 is pressed by the reinforcing ribs and can rotate relative to the pushingblock 62, and the tiltingstructure 622 can be completely separated from the pushingrack 63.

In other embodiments, thependulum push rod 66 only contacts, but is not connected to, the rear end of thesleeve 67. Thependulum push rod 66 can only push thesleeve 67 to move towards the front end to complete the pre-pressing operation and the limiting operation, and can not pull thesleeve 67 to move backwards to withdraw the pre-pressing assembly and the limitingmandril 53 to the back end to the initial state. The firingrod 69 is arranged in thesleeve 67 and the firingrod sleeve 68, two sides of the firingrod 69 are provided with a step structure 691 (a section of the firingrod 69 behind thestep structure 691 is provided with a left plane and a right plane, as shown in fig. 27), and the front end of thepre-pressing insertion sheet 54 can be contacted with the rear end face of thestep structure 691. In the process that thereset rod 81 pulls the pushingrack 63 to retreat, the pushingrack 63 drives the fan-shapedswing block 64 to rotate anticlockwise (facing to the direction of fig. 15) around the rotating shaft so as to release the pre-pressing locking state, and meanwhile, the swingblock connecting rod 65 and the swingblock push rod 66 move backwards; the pushingrack 63 also pulls the firingrod 69 to retreat, pushes thepre-pressing insertion sheet 54 backwards through astep structure 691 of the firingrod 69, and utilizes thepre-pressing insertion sheet 54 to pull other pre-pressing components directly or indirectly connected with thepre-pressing insertion sheet 54 backwards to move towards the rear end, so as to drive thepre-pressing sleeve 51 to retreat, and open the jaw of the actuator 1; thepre-pressing insertion piece 54 moves backwards and also drives the firingrod sleeve 68 to sequentially push thesleeve 67, the swingblock push rod 66, the swingblock connecting rod 65 and thesector swing block 64 backwards (or swing).

As shown in fig. 18 and 24, the return assembly further includes areturn hook 85 and areturn spring 86. Thereturn hook 85 has a rear end connected to thereturn lever 81 and a front end connected to thereturn spring 86. The front end of thereturn hook 85 is tilted upward, facilitating better hooking of thereturn spring 86. Athird groove 636 of the pushing rack is arranged on the upper surface of the pushingrack 63. Thereturn hook 85 and thereturn spring 86 are disposed in thethird groove 636 of the push rack. The front end of thereturn spring 86 is fixedly attached to the front side of the interior of thethird recess 636 of the push rack. When thereset rod 81 is pulled backwards, a process of moving in the X-direction reset rod first throughhole 635 is involved, at this time, thepush rack 63 does not move, but thereset rod 81 can sequentially pull thereset hook 85 and thereset spring 86 which are arranged in the push rackthird groove 636, and thereset spring 86 stores power. Thereset rod 81 is released after thepush rack 63 is pulled back to the initial position by thereset rod 81, thereset hook 85 and thereset rod 81 can be sequentially driven to return to the initial position by thereset spring 86, meanwhile, thereset sheet 82 moves upwards and forwards along thereset pin 83 through the reset inclinedhole 820, and finally, thereset rod 81, thereset hook 85, thereset sheet 82 and thereset spring 86 all return to the initial position.

As shown in fig. 18 and 23, astopper 60 fixed in the firingassembly 6 is provided above thepush rack 63, a fourthpush rack recess 637 recessed toward thecentral axis 9 is provided on a side surface of thepush rack 63, and a lower end of thestopper 60 extends into the fourthpush rack recess 637 and abuts against a rear side surface of the fourthpush rack recess 637 in an initial state. Thescreens 60 are connected with the screens springs 600, the screens springs 600 provide elastic force for thescreens 60, the lower ends of thescreens 60 provide backward acting force for the pushingracks 63, the pushingracks 63 can be set relatively stably in the initial state, thehandle 61 is prevented from being slightly disturbed, thehandle 61 is pressed down in the non-operation state, and the pushingracks 63 are driven to push thepre-pressing assembly 5 to perform pre-pressing operation and limiting operation. During normal use of the stapler, thehandle 61 is pressed down, overcoming the elastic force of thedetent spring 600, to push therack 63 forward. The rear side of fourthpush rack recess 637 pushesdetent 60 forward, causingdetent 60 to rotate clockwise (to face in the direction of fig. 17), and the lower end ofdetent 60 disengages from fourthpush rack recess 637, but the lower end ofdetent 60 still abuts against the upper surface ofpush rack 63. In the process of withdrawing thepush rack 63, when the lower end of thedetent device 60 contacts the rear side of thefourth recess 637 of the push rack again, thedetent device 60 rotates counterclockwise by the elastic force of thedetent spring 600, and the lower end of thedetent device 60 pulls thepush rack 63 to continue to provide a backward acting force to thepush rack 63.

The range of motion of the cutting knife is limited by the length of the pushingrack teeth 632 and the length of the through slot in thecartridge assembly 11 for movement of the cutting knife. In some embodiments, different lengths of thecartridge assembly 11 may be selected depending on the surgical needs, and the length of the channel through which the cutting knife moves may vary. In general, in thecartridge assembly 11, the longest arrangement length of the staples is 60mm, that is, the length of the through slot for the movement of the cutting knife is 60 mm; therefore, the entire length of the pushingrack teeth 632 should be set to at least 60 mm.

In the embodiment as described above, the present invention provides the stapler capable of performing actions including a turning operation, a preloading operation and a restraining operation, wherein the turning operation includes a deflecting operation and a rotating operation. In the embodiment in which the actuator 1 is subjected to the yaw operation, that is, the actuator 1 is deflected at an angle to the left or right with respect to thecentral axis 9, it is preferable that the yaw operation be performed on the premise that the rotation operation is completed, and the limit operation be performed on the premise that the steering operation is completed. In the embodiment that the deflection operation is not performed on the actuator 1, that is, the actuator 1 is always positioned on thecentral shaft 9 during the cutting process, only the execution sequence of the limiting operation is limited, and the execution of the limiting operation is based on the premise that the deflection operation is completed; the order of execution of the other executable actions is not limited. From the perspective of the instrument design alone, whether the jaws of actuator 1 are open or closed, it is possible to deflect actuator 1, which is connected to anchorblock 32, to the appropriate angle withanchor block 32 by means of a steering operation. In practical application, the locking (limiting operation) of the adjusted angle and the closing of the actuator 1 through the pre-pressing operation can be completed simultaneously according to requirements; alternatively, the two operations are performed asynchronously, for example, the angle is adjusted and then the actuator 1 is closed, or the angle is adjusted and then the actuator 1 is closed. And after the steering operation, the pre-pressing operation and the limiting operation are all completed, the cutting and anastomosis operation is carried out.

In some embodiments, the firingassembly 6 includes a motor that is electrically driven to move the advancingrack 63. And a button for turning on or off the motor is arranged outside the anastomat. In embodiments provided with a motor, thehandle 61 may not be provided, with electric drive as the only way to drive the movement of the pushingrack 63; ahandle 61 may also be provided, and both manual actuation of thehandle 61 and electrical actuation of the motor may be used as a means of driving the movement of the pushingrack 63. In embodiments involving electrical actuation, when the advancement of cuttinghead 41 is blocked by a tissue anomaly, the motor can be controlled by the processing unit to turn on and off by providing a mechanical sensor to transmit a mechanical signal to the processing unit.

In some embodiments, a reminding device is provided to remind the operator whether the pre-pressing operation and the limiting operation are in place, and the moving distance of the cutter head of the cutter assembly 4. The following reminding means includes, but is not limited to, sounding a warning sound or flashing a warning light in the visual range of the operator. And after the cutting anastomosis operation is finished, performing withdrawal operation, and resetting and clearing the signal of the sensor when the structure provided with the reminding device is restored to the corresponding initial position.

In the embodiment of setting a reminding device to remind an operator whether the pre-pressing operation is in place, the reminding device may be a sensor, the sensor is arranged on thepre-pressing sleeve 51 or the actuator 1, and when the front end of thepre-pressing sleeve 51 contacts with the blocking mechanism of the actuator 1, the reminding device reminds the operator that the pre-pressing operation is in place; the sensor can also be a distance sensor arranged on thepre-pressing sleeve 51, and reminds an operator of the pre-pressing operation to be in place after the forward movement distance of thepre-pressing sleeve 51 reaches the maximum movement distance designed for thepre-pressing sleeve 51; or the sensors are arranged on thenail bin assembly 11 and the nail feltassembly 12, and after a jaw formed by thenail bin assembly 11 and the nail feltassembly 12 is closed and thenail bin assembly 11 is contacted with the nail feltassembly 12, an operator is reminded of pre-pressing operation in place.

In the embodiment of arranging the reminding device to remind the operator whether the limiting operation is in place, the reminding device can be a sensor, and the sensor is arranged on the groove structure of the fixedblock 32 or the limitingejector rod 53; when the front end of thelimit post rod 53 is inserted into a certain tooth groove of the fixedblock tooth groove 32120, or the forward movement distance of thelimit post rod 53 reaches the maximum movement distance designed for thelimit post rod 53, an operator is reminded of the limit operation in place.

In embodiments where a reminder is provided to alert the operator of the distance the tool bit has moved, the reminder can be a graduated line on the housing of the firing assembly at thereset rod channel 810. When thesafety block 603 enters the lockinggroove 630, the corresponding position of thereset rod 81 in thereset rod channel 810 is marked as the position 0, and the upper side or the lower side of thereset rod channel 810 is marked with 0 graduation line on the housing of the firing assembly; the longest arrangement length of the anastomotic nails in thenail bin assembly 11 is 60mm, namely the movable range of the cutter assembly 4 is 60 mm; therefore, 0 scale mark is used as an initial position, the front end is arranged along the X direction, and a plurality of scale marks with corresponding distances are arranged on the shell of the firing assembly; the scale marks at least comprise 30mm scale marks and 45mm scale marks, and the total length of the scale marks is at least 60 mm. Graduation marks may also be marked on theadvance rack 63 when thereset rod channel 810 has a width in the Z direction that exposes theadvance rack 63 inside the firingassembly 6. The reminding device can be an acousto-optic reminding device comprising a sensor, the position of the sensor is not limited, and the reminding device can be arranged at the position of a cutter head or a cutter handle of the cutting knife assembly 4 or on the pushingrack 63; at least when the cutting knife assembly 4 moves forward 30mm, 45mm and 60mm, a warning is given to the operator. The reminding device can be a number counter, for example, arranged on the pushingrack 63, when the pushingrack 63 is pushed forward to a unit length, the rotating wheel of the number counter is shifted once, and the number counter counts once; meanwhile, a display screen can be arranged on the shell of the firing assembly, and the number recorded by the frequency counter is fed back to the display screen through the processing unit and displayed to an operator; but at least once when the advancingrack 63 advances the cutting blade assembly 4 by 30mm, 45mm and/or 60 mm.

As shown in fig. 1, 25 and 26, the large-angle stapler disclosed by the present invention further includes acentral tube assembly 7, and thecentral tube assembly 7 is used for transmitting the motion of each assembly at the input end to each assembly at the execution end, or for stabilizing, protecting or connecting other structures of the stapler. Thecenter tube assembly 7 includes anouter tube 71 and a center tube connector. Theouter tube 71 is sleeved on the outermost side of the part between the tail end of thepre-pressing sleeve 51 and the front end of thesteering mechanism 2, specifically, the rear part of thepre-pressing sleeve 51 is sleeved in theouter tube 71, the rear part of theouter tube 71 is sleeved in the front end of the shell structure formed by the upperrotating block 231 and the lowerrotating block 232, the cutting knife assembly 4, the driving connecting piece and the other structures of thecentral tube assembly 7 are all arranged in theouter tube 71, and theouter tube 71 plays a role in fixing and limiting sleeved structures in theouter tube 71 and provides a moving space for the structures. The central tube connecting pieces are arranged at the upper side and the lower side of the instrumentcentral shaft 9 and are respectively positioned at the rear ends of the fixing block upper connectingpiece 3211 and the fixing block lower connectingpiece 3212, and the rear end of the connecting and fixingplate 37 is embedded at the front end of thecentral tube assembly 7. The rear end of thecenter tube assembly 7 is connected to thesteering mechanism 2. The central tube connector on each side may be an integrally formed structure (generally, rod-shaped, plate-shaped or column-shaped, but not limited thereto), or may be formed by connecting a plurality of connecting sections in sequence (the adjacent connecting sections may have the same or different structures). When the central pipe connecting piece is arranged into a plurality of connecting sections which are sequentially connected, on one hand, the length of each connecting section is shorter, the processing process is simpler, and meanwhile, the strength of the instrument can be improved; on the other hand, different connecting sections can be selected to be combined and connected according to different use scenes of the anastomat, so that the anastomats with different lengths can be obtained.

The drive connectors on the left and right sides of the instrumentcentral shaft 9 are clamped between the upper and lower central tube connectors. The total length of the driving connecting piece and the central pipe connecting piece is approximately the same, and different connecting sections of the driving connecting piece and the central pipe connecting piece are selected and matched with each other to adjust the length of the anastomat. In principle, the upper and lower centre tube connectors are of an axisymmetrical configuration with respect to thecentral axis 9. However, in embodiments where only one restrainingpost 53 is provided, the configuration of the lower center tube connection needs to be adapted.

In this example, the connection section provided at the foremost end of the center tube connection member is acutter guide plate 72. Thecutter guide plate 72 includes an upper cutter guide plate and a lower cutter guide plate which can be aligned and fitted to each other and are respectively provided at the rear ends of the fixing blockupper connector 3211 and the fixing blocklower connector 3212. The cuttingknife guide plate 72 can bear other parts connected with the cutting knife guide plate and has a limiting effect, so that the cutting knife guide plate can only move along the X direction; because the cutter assembly 4 is arranged in the space enclosed by the upper cutter guide plate and the lower cutter guide plate, thecutter guide plate 72 can also limit the running direction of the cutter assembly 4. The rear end of the connecting fixingplate 37 is embedded on the cuttingknife guide plate 72, and the front end of the cuttingknife guide plate 72 is correspondingly provided with a groove for embedding the connecting fixingplate 37. The front end of the lowerpre-pressing ejector rod 521 is connected with the tail end of the limitingejector rod 53, and the front end of the limitingejector rod 53 is embedded into the tail end of the connecting and fixingplate 37 on the lower side; the rear section of the connecting fixingplate 37, the limitingejector rod 53 and theprepressing ejector rod 52 are embedded into the lower cutting knife guide plate. The outer side of the cuttingknife guide plate 72 comprises a protruding structure, a corresponding groove is formed in theouter tube 71, and the cuttingknife guide plate 72 is embedded in theouter tube 71 through the protruding structure.

The rear end of theouter tube 71 is connected to thesteering mechanism 2. The operator rotates the housing structure composed of the upperrotary block 231 and the lowerrotary block 232 by 360 degrees with thecentral shaft 9 as the rotary shaft, and the housing structure can drive the positioningcollision bead 22, therotary shaft 24 and the steeringknob 21 to rotate, which is the rotary operation in the steering operation. Preferably, the housing structure formed by the upperrotary block 231 and the lowerrotary block 232 is provided with a concave-convex structure convenient for the operator to hold and rotate by hand. The shell structure drives theouter tube 71, the central tube connecting piece, the connecting fixingplate 37 and the fixingblock 32 to rotate in sequence, and the fixingblock 32 drives the actuator 1 to rotate. In the process, since the other components not mentioned above, including thepre-pressing component 5, the driving component and the cutting knife component 4, are mutually connected or nested, when the rotation operation is performed, except that thefiring component 6 at the rear end of thesteering mechanism 2 does not rotate, other structures can be driven by thesteering mechanism 2 to rotate together by the same angle. Thesleeve 67 is provided with a through hole which is communicated along thecentral shaft 9, the front ends of the left and right swingblock push rods 66 are arranged at the rear end of thesleeve 67, and thesleeve 67 can rotate around thecentral shaft 9 relative to the swingblock push rods 66, so as to drive thetrigger rod sleeve 68, thepre-pressing push rod 52, the limitingpush rod 53, the fixedblock 32 and the actuator 1 to rotate together. Thesleeve 67 is provided with a left and right symmetrical groove on the outer wall, the left andright bogies 26 can be respectively arranged in the groove to clamp thesleeve 67, and when therotating block 23 is operated to rotate around thecentral shaft 9, the sleeve is driven to rotate around thecentral shaft 9 through the rotatingshaft 24, thesteering connecting block 25 and thebogies 26. Thebogie 26 also drives the drive connection member, thecutting blade guard 31, the cuttingblade guard liner 36 and the holdingblock 32 to rotate about thecentral axis 9.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims (39)

1. An anastomat is characterized in that a plurality of anastomats are arranged in a straight line,

the anastomat is provided with a pushing rack, a swinging block connecting rod, an intermediate driving part and a prepressing sleeve;

the swinging block can rotate around a rotating shaft under the driving of the pushing rack;

the near end and the far end of the swinging block connecting rod are respectively hinged with the swinging block and the near end of the middle driving part;

the far end of the middle driving part is connected with the prepressing sleeve;

when the swinging block rotates in the first direction, the swinging block connecting rod drives the middle driving part and the prepressing sleeve to move towards the far end of the anastomat, and the jaw of the executor is closed through the prepressing sleeve.

2. The stapler of claim 1,

a first included angle is formed between the swing block connecting rod and the central axis of the anastomat; the opening of the first included angle faces to the proximal end of the anastomat; the pushing rack moves towards the near end or the far end of the anastomat along the central axis of the anastomat and drives the swinging block to rotate, and the angle of the first included angle is increased or decreased.

3. The stapler of claim 1,

a second included angle is formed between the swing block and the swing block connecting rod; a connecting line from the hinged position of the swing block and the swing block connecting rod to the rotating shaft forms an included angle with the swing block connecting rod, and the included angle is the second included angle;

and when the pushing rack moves towards the near end or the far end of the anastomat and drives the swinging block to rotate, the angle of the second included angle is reduced or enlarged.

4. The stapler of claim 3,

when the jaw of the actuator is not closed by the prepressing sleeve, the second included angle is an acute angle with the opening facing to the distal end of the anastomat; in the closing process of a jaw of the actuator by the prepressing sleeve, the second included angle is adjusted to be an obtuse angle with an opening facing to the far end of the anastomat; continuously impel the propulsion rack drives the pendulum piece and continuously rotates, makes the second contained angle from the opening towards the obtuse angle of anastomat distal end, adjusts to the straight angle to the second contained angle, and the second contained angle adjustment is the obtuse angle of opening towards the anastomat near-end again, and the pendulum piece connecting rod contacts the limit point that sets up in the firing subassembly shell this moment, with the rotation locking of pendulum piece, forms the dead state of lock.

5. The stapler of claim 4,

after the jaw of the actuator is closed by the pre-pressing sleeve, the reaction force from the pre-pressing sleeve is transmitted to the swing block through the middle driving part and the swing block connecting rod, the angle and the opening direction of the current second included angle of the swing block are kept, the pre-pressing sleeve is locked, and the jaw is continuously closed.

6. The stapler of claim 1,

the anastomat is provided with a firing rod and a cutting knife assembly, the firing rod is connected between the far end of the propelling rack and the near end of the knife handle of the cutting knife assembly and can move along the central axis of the instrument under the driving of the propelling rack; the firing rod is also connected with the middle driving part;

the pushing rack moves towards the far end of the anastomat and drives the swinging block to rotate around the rotating shaft in the first direction, and the pre-pressing sleeve moves to a set position outside the near end of the actuator to close the jaw of the actuator;

the pushing rack moves towards the near end of the anastomat, when the swinging block is driven to rotate around the rotating shaft in the second direction, the pre-pressing locking state is released, and meanwhile, the swinging block connecting rod moves towards the near end of the anastomat; the pushing rack also drives the firing rod to move towards the near end of the anastomat, the firing rod drives the pre-pressing sleeve to move towards the near end of the anastomat through the middle driving part, so that the pre-pressing sleeve is moved away from the set position, and the jaw of the executor is opened;

the first direction is clockwise and the second direction is counterclockwise; alternatively, the first direction is counterclockwise and the second direction is clockwise.

7. The stapler of claim 6,

the swinging block rotates around the rotating shaft in a first direction, and does not rotate around the rotating shaft any more after being blocked by a limiting component arranged on the anastomat; at this point, the pusher rack can continue to move distally of the stapler without rotating the pendulum mass.

8. The stapler of claim 7,

when the swinging block rotates around the rotating shaft in the first direction to the maximum swinging angle, the swinging block is blocked by an inclined plane arranged in a shell of a firing assembly of the anastomat, and the swinging block stops rotating continuously.

9. The stapler according to any one of claims 1-8,

the pushing rack is provided with a section of first racks which are arranged along a straight line; the straight line is parallel to the instrument central axis of the anastomat; the swing block is provided with a section of gear structure arranged along an arc shape;

the gear structure is meshed with or separated from the first rack along with the pushing rack moving along the central axis of the instrument; when the gear structure is meshed with the first rack, the swinging block rotates around the rotating shaft under the driving of the pushing rack.

10. The stapler of claim 9,

the first rack is positioned at the upper part of the pushing rack and protrudes out of the upper surface of the pushing rack; the swinging block is arranged above the pushing rack, and the gear structure is positioned on the arc-shaped lower surface of the swinging block;

when the pushing rack drives the swinging block to rotate, the teeth which are currently meshed with the first rack in the gear structure of the swinging block are switched.

11. The stapler of claim 9,

the process from the step that the push rack drives the swing block to rotate around the rotating shaft in the first direction corresponds to the process from the step that teeth at the farthest end of the gear structure are meshed with teeth grooves at the farthest end of the first rack to the step that teeth grooves at the nearest end of the gear structure are meshed with teeth at the nearest end of the first rack;

and the process from the process that the pushing rack drives the swinging block to rotate around the rotating shaft in the second direction corresponds to the process from the meshing of the tooth socket at the most proximal end of the gear structure and the tooth socket at the most proximal end of the first rack to the process from the meshing of the tooth socket at the most distal end of the gear structure and the tooth socket at the most distal end of the first rack.

12. The stapler of claim 9,

the pushing rack moves towards the far end of the anastomat, and when the gear structure of the swinging block is disengaged from the first rack, the pre-pressing sleeve moves to a set position outside the near end of the actuator to close the jaw of the actuator; when the pushing rack continues to move towards the far end of the anastomat, the swinging block is not driven to rotate any more; the jaws of the actuator are continuously closed by the pre-stressed sleeve.

13. The stapler of claim 9,

the pushing rack is provided with a section of second rack and a section of idle stroke groove, the second rack and the idle stroke groove are positioned on the same surface of the pushing rack, and the idle stroke groove is closer to the far end of the pushing rack than the second rack;

a pushing block is arranged at the handle of the anastomat and rotates along with the rotation of the handle;

the tilting end of the pushing block is moved to a tooth groove at the farthest end of the second rack from the idle-stroke groove by operating the handle, the pushing rack moves to the far end of the anastomat and drives the swinging block to rotate to the limit position of the swinging block around the rotating shaft in the first direction; at the moment, the prepressing sleeve pipe moves to a set position outside the near end of the actuator, and the jaw of the actuator is closed;

and then, the tooth groove of the second rack, which is currently entered by the tilting end of the pushing block, is switched by controlling the handle each time to push the pushing rack to continuously move to the far end of the anastomat, and the pushing rack does not drive the swinging block to rotate any more.

14. The stapler of claim 1,

the middle driving part comprises a prepressing ejector rod, a prepressing insertion piece, a trigger rod sleeve, a sleeve and a swinging block push rod which are arranged in sequence, can transmit acting force from the swinging block connecting rod, moves towards the far end or the near end of the anastomat along the central axis of the instrument and drives the prepressing sleeve to move towards the far end or the near end of the anastomat;

the near end of the pendulum block push rod parallel to the central axis of the instrument is hinged with the far end of the pendulum block connecting rod; the sleeve is allowed to rotate around the central axis of the instrument relative to the swing block push rod between the proximal end of the sleeve and the distal end of the swing block push rod; the sleeve is provided with a through hole along the central axis of the instrument, and the near end of the firing rod sleeve is connected to the far end of the through hole of the sleeve; the far end of the trigger rod sleeve is connected with the near end of the prepressing ejector rod through a prepressing insertion piece; the far end of the prepressing ejector rod is connected with the near end of the prepressing sleeve.

15. The stapler of claim 14,

the pre-pressing ejector rod is provided with a protruding T-shaped structure and is embedded into a T-shaped groove of the pre-pressing sleeve.

16. The stapler of claim 14,

the prepressing sleeve is respectively connected with two prepressing ejector rods on two sides of the central axis of the apparatus; at least one prepressing insert is connected between the two prepressing ejector rods; a firing rod penetrates through the firing rod sleeve, is connected between the far end of the propelling rack and the near end of the cutter handle of the cutter assembly and can move along the central axis of the instrument under the driving of the propelling rack; when the trigger rod sleeve and the trigger rod move, the two prepressing ejector rods are driven to move by the prepressing insertion pieces; the prepressing insertion piece is embedded in the circumferential surface of the trigger rod sleeve; the circumference surface of firing bar is provided with the step, and the near-end of step and the distal end contact of pre-compaction inserted sheet drive the pre-compaction inserted sheet and remove to the near-end of anastomat when the firing bar withdraws.

17. The stapler of claim 16,

the anastomat is provided with a reset assembly for driving the pushing rack to move towards the near end of the anastomat to realize retraction; through withdrawing, make the propulsion piece leave the surface of propelling rack, the propulsion rack can drive the pendulum piece again, and the limited position from the pendulum piece is around the rotation axis with the second direction, and meanwhile, the propulsion rack drives the firing bar and withdraws, and the distal end of the step near-end contact pre-compaction inserted sheet through the firing bar drives the pre-compaction inserted sheet and moves to the near-end of anastomat, and then draws the pre-compaction sleeve pipe through the pre-compaction ejector pin, makes the pre-compaction sleeve pipe can remove from the setting position of executor near-end outside, and the jaw of executor opens.

18. The stapler of claim 17,

the anastomat is provided with a safety block which can prevent the pushing rack from moving to the far end or the near end of the anastomat when entering the limit groove of the pushing rack; the safety block can leave the limiting groove by operating the safety button; the safety block has an initial position outside the range of the pushing rack;

when the pushing block is driven to move the pushing rack to the far end of the anastomat by controlling the handle, the safety block enters a limit groove in the range of the pushing rack from the initial position of the safety block; at the moment, the swinging block is driven by the pushing rack to rotate to the limit position of the swinging block around the rotating shaft in the first direction, and the pre-pressing sleeve moves to the set position outside the near end of the actuator to close the jaw of the actuator.

19. The stapler of claim 18,

the pushing rack is driven to move towards the near end of the anastomat by controlling the reset assembly, and when the withdrawing is implemented, the safety block returns to the initial position outside the range of the pushing rack from the limiting groove; at the moment, the pushing rack can drive the swing block again, the swing block rotates around the rotating shaft in the second direction from the limited position of the swing block, the pushing rack drives the firing rod to retract, the pre-pressing sleeve is driven to move through the firing rod, the pre-pressing insertion piece and the pre-pressing ejector rod, the pre-pressing sleeve can move away from the set position outside the near end of the actuator, and the jaw of the actuator is opened.

20. The stapler of claim 1,

the swing block is provided with a connecting rod connecting piece which is parallel to the rotating shaft of the swing block; the connecting rod connecting piece penetrates through a waist-shaped hole at the near end of the swinging block connecting rod, so that the swinging block is hinged with the near end of the swinging block connecting rod.

21. The stapler of claim 1,

the actuator of the anastomat is driven by a fixing block connected with the near end of the anastomat to deflect relative to the central axis of the instrument; the middle driving part comprises a prepressing ejector rod connected with the prepressing sleeve, and the prepressing ejector rod is also used for driving the limiting ejector rod to move towards the far end of the anastomat until the limiting ejector rod is inserted into a groove corresponding to the current deflection angle at the fixed block, so as to lock the deflection angle; the fixing block is provided with a plurality of grooves corresponding to different deflection angles.

22. The stapler of claim 21,

the prepressing sleeve is provided with a limiting groove, and the limiting ejector rod can move in the limiting groove; when the prepressing sleeve is driven by the prepressing ejector rod to move towards the near end of the anastomat, the far end point of the limiting groove is abutted to the limiting ejector rod, and the limiting ejector rod is withdrawn from the groove of the fixing block.

23. The stapler of claim 22,

when the limiting ejector rod is inserted into a groove corresponding to the current deflection angle at the fixed block, the pre-pressing sleeve reaches the set position at the actuator, and the jaw of the actuator is closed; when the limiting ejector rod is withdrawn from the groove of the fixed block, the pre-pressing sleeve leaves the set position of the actuator, and the jaw of the actuator is opened.

24. The stapler of claim 14 or 21,

the prepressing ejector rod is positioned in a groove formed in the guide part and can move towards the far end or the near end of the anastomat along the central axis of the instrument in the groove; the guide part is positioned outside the knife handle of the cutting knife assembly and the trigger rod sleeve; the near end of the prepressing sleeve is sleeved outside the far end of the guide part.

25. The stapler of claim 21,

the two cutting knife guard plates are positioned on two sides of the central axis of the instrument and are arc structures with opposite inner surfaces, and the inner surfaces of the two cutting knife guard plates are recessed to form a space for the knife handle of the cutting knife assembly to move along the central axis of the instrument; the inner surface is a surface close to the central axis of the instrument;

one of the two cutting knife guard plates moves towards the near end of the anastomat, and when the other one moves towards the far end of the anastomat, the two cutting knife guard plates deflect relative to the central axis of the instrument respectively, the knife handle also deflects relative to the central axis of the instrument, and the knife handle is attached to the inner surface of the cutting knife guard plate corresponding to one side of the knife handle due to deflection, so that smooth turning is realized.

26. The stapler of claim 25,

two elastic pieces are arranged between the cutting knife guard plates and used as inner liners;

the inner surface of the cutting knife guard plate is provided with a groove matched with the lining;

when the knife handle does not deflect, the two linings are respectively positioned on the two sides of the knife handle and are tightly attached to the surface of the knife handle;

the part of the knife handle protruding towards one side of the knife handle is deflected, the corresponding lining at the side is pushed to deform and enter the groove of the cutting knife guard plate at the side, and the part of the knife handle protruding towards the side can be attached to the inner surface of the cutting knife guard plate and/or the lining at the side, so that smooth turning is realized;

the concave part at the other side of the knife handle is tightly attached by the lining which is reversely deformed and corresponds to the other side.

27. The stapler of claim 25,

the actuator of the anastomat is driven by a fixing block connected with the near end of the anastomat to deflect relative to the central axis of the instrument; the far ends of the two cutting knife guard plates are rotatably connected to the first side and the second side of the fixing block and are used for driving the fixing block to deflect; the first side and the second side are located on both sides of the instrument central axis and respectively correspond to the deflection directions.

28. The stapler of claim 27,

the prepressing sleeve comprises a first prepressing sleeve close to the far end of the anastomat and a second prepressing sleeve close to the near end of the anastomat, and the first prepressing sleeve and the second prepressing sleeve can deflect relatively through the hinge of the sleeve connecting piece between the first prepressing sleeve and the second prepressing sleeve;

when the actuator is driven by a fixed block connected with the actuator to deflect relative to the central axis of the instrument, a first pre-pressing sleeve sleeved outside the actuator and/or the fixed block deflects relative to the central axis of the instrument, and a second pre-pressing sleeve does not deflect relative to the central axis of the instrument;

and a space is reserved between the first pre-pressing sleeve and the second pre-pressing sleeve for the deflection of the fixing block and/or the cutting knife protection plate relative to the central axis of the instrument.

29. The stapler of claim 27,

the fixed block is provided with a fixed block connecting part extending towards the near end of the anastomat;

the fixed block connecting part is hinged with the far end of the fixed plate, and the fixed block deflects relative to the central axis of the instrument around the hinged position; the proximal end of the fixing plate is embedded into the groove at the distal end of the guide part, so that the fixing plate does not deflect relative to the central axis of the instrument.

30. The stapler of claim 25 or 29,

the near ends of the two cutting knife guard plates are respectively and correspondingly connected with the far ends of the two driving connecting pieces; one driving connecting piece drives the corresponding cutting knife protecting plate to move towards the near end of the anastomat, and the other driving connecting piece drives the corresponding cutting knife protecting plate to move towards the far end of the anastomat, so that the two cutting knife protecting plates deflect relative to the central axis of the instrument; the near ends of the two driving connecting pieces are respectively connected with a steering mechanism; under the drive of the steering mechanism, the cutting knife guard plate, the fixed block and the actuator are driven by the driving connecting piece to rotate around the central axis of the instrument and/or deflect relative to the central axis of the instrument.

31. The stapler of claim 30,

the anastomat is provided with a guide part, and the guide part comprises two guide plates and a guide sleeve, wherein the two guide plates are respectively positioned on the third side and the fourth side of the central axis of the instrument, and the guide sleeve is connected to the proximal ends of the two guide plates; the third side and the fourth side are not in the deflection direction of the cutting knife protection plate relative to the central axis of the instrument;

the two driving connecting pieces are respectively positioned on the first side and the second side corresponding to the deflection direction, are respectively provided with a connecting rod and a steering pull rod which are connected, and are connected with a bogie of the steering mechanism through the steering pull rod;

the connecting rods of the two driving connecting pieces are respectively arranged between the two guide plates; the two steering pull rods are respectively arranged outside the first side and the second side of the guide sleeve and extend to the outside of the position where the guide plate is connected with the guide sleeve; an outer tube is sleeved outside the guide part.

32. The stapler of claim 9,

the pushing rack is driven by the motor to move towards the near end or the far end of the anastomat.

33. A method for controlling a stapler according to any one of claims 1-31, wherein the same handle is manipulated to push a pushing rack toward a distal end of the stapler by a pushing block connected to the handle, comprising:

in the first propulsion stage, a handle is controlled, a propulsion rack is driven by a propulsion block to move a first distance to the far end of the anastomat, the propulsion rack drives a swing block to rotate around a rotating shaft to a limited position in a first direction, a swing block connecting rod and an intermediate driving part drive a pre-pressing sleeve to move to the far end of the anastomat, so that the pre-pressing sleeve reaches a set position outside the near end of the actuator, and a jaw of the actuator is closed;

in the second propulsion stage, the same handle is operated, the propulsion rack is driven by the propulsion block to move continuously to the far end of the anastomat, the swing block stops rotating in the process, the jaw of the executor is closed continuously by the pre-pressing sleeve, and the propulsion rack drives the cutter assembly to move to the far end of the executor by the firing rod.

34. The method of controlling a stapler according to claim 33,

the control method further comprises a withdrawing phase; through the reset assembly of operation anastomat, drive and impel the rack and remove to the near-end of anastomat, realize withdrawing, make and impel the rack and can drive the pendulum block again, from the limited position of pendulum block with the second direction around the rotation of axes, at this moment, impel the rack and still drive the firing bar and withdraw, the distal end of step near-end contact pre-compaction inserted sheet through firing bar circumference surface drives the pre-compaction inserted sheet and removes to the near-end of anastomat, and then draws the pre-compaction sleeve pipe through the pre-compaction ejector pin that is connected with the pre-compaction inserted sheet, make the pre-compaction sleeve pipe can follow the setting position of executor near-end outside and remove, and the keeping.

35. The method for controlling a stapler according to claim 33 or 34,

the rotation of the executor around the central axis of the instrument and/or the deflection of the executor relative to the central axis of the instrument are realized by controlling a steering mechanism of the anastomat; in the first propulsion stage, a propulsion rack drives a swing block to rotate, so that the deflection angle of the actuator is locked while the prepressing sleeve moves to a set position to close the jaw of the actuator;

wherein, a component for locking the deflection angle is arranged at the steering mechanism; or the limiting ejector rod connected with the far end of the middle driving part is inserted into a groove corresponding to the current deflection angle at the fixed block along with the movement of the middle driving part, and the deflection angle is locked; a plurality of grooves corresponding to different deflection angles are formed in the fixed block; the fixed block drives the actuator to deflect.

36. The method of controlling a stapler according to claim 35,

after the first propulsion stage is finished, the pre-pressing sleeve is moved away from the set position of the actuator through retraction, a jaw of the actuator is opened, and the deflection angle is unlocked;

after the deflection angle is adjusted, the first propulsion stage is executed again, the pre-pressing sleeve pipe reaches the set position of the actuator, the jaw of the actuator is closed, and the adjusted deflection angle is locked.

37. The method of controlling a stapler according to claim 33,

the first propulsion stage is a process of operating the handle for the first time to rotate the handle;

the second propulsion stage is a process of operating the handle to rotate for a plurality of times after the first time;

the rotation angle of the handle in the first rotation is larger than or equal to the rotation angle of the handle in each rotation after the first rotation.

38. The method of controlling a stapler according to claim 34,

in the first pushing stage, a first distance for the pushing rack to move to the far end of the anastomat corresponds to a distance for the tilting end of the pushing block to move from the idle-stroke groove of the pushing rack to one tooth groove at the far end of the second rack; the lost motion slot is closer to the distal end of the push rack than the second rack;

in the second propelling stage, the tilting end of the propelling block is in the range of the second rack, and the tooth groove into which the tilting end enters is switched; in the withdrawing stage, the tilting end of the pushing block leaves the surface of the pushing rack and is not in contact with the pushing rack.

39. The method of controlling a stapler according to claim 34,

the safety block of the anastomat can prevent the pushing rack from moving to the far end or the near end of the anastomat when entering the limit groove of the pushing rack; the safety block has an initial position outside the range of the pushing rack;

in the first propulsion stage, when the propulsion block is driven to move the propulsion rack to the far end of the anastomat by controlling the handle, the safety block enters a limit groove in the range of the propulsion rack from the initial position of the safety block;

operating the safety button to enable the safety block to leave the limiting groove;

in the withdrawing stage, the safety block returns to the initial position outside the range of the pushing rack from the limiting groove under the pushing of the resetting sheet on the side surface of the pushing rack.

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